--- product_id: 512296597 title: "21 pin sound decoder" price: "€ 0.09" currency: EUR in_stock: false reviews_count: 13 url: https://www.desertcart.es/products/512296597-21-pin-sound-decoder store_origin: ES region: Spain --- # Compact 2.95cm length Bluetooth & DCC dual control 21-pin sound decoder for rich audio 21 pin sound decoder **Price:** € 0.09 **Availability:** ❌ Out of Stock ## Summary > 🚂 Elevate your model railway with sound that moves you! ## Quick Answers - **What is this?** 21 pin sound decoder - **How much does it cost?** € 0.09 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/512296597-21-pin-sound-decoder) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Ultra-Compact Design:** At just under 3cm, fits snugly inside your model without bulk or compromise. - • **Intuitive App Control:** Easily update firmware, customize sound profiles, and manage CV values via a user-friendly smartphone app. - • **Immersive Realistic Sound:** Experience authentic steam chuffs and train sounds that elevate your model railway to a new sensory level. - • **Plug & Play Compatibility:** Works flawlessly with select Hornby 00 gauge trains and standard DCC controllers—no batteries needed. - • **Seamless Bluetooth & DCC Integration:** Switch effortlessly between manual DCC control and wireless Bluetooth app for ultimate convenience. ## Overview The Hornby R7322 HM7000-21TXS is a compact, 21-pin sound decoder designed for 00 gauge model trains. It offers seamless Bluetooth and DCC control, enabling easy firmware updates and sound customization through an intuitive app. Compatible with select Hornby models and standard DCC controllers, it requires no batteries and delivers immersive, realistic train sounds to enhance your rail modeling experience. ## Description From the manufacturer New HM7000 Bluetooth Model Railway Control App A new digital app control system that brings your layout to life through the touch of a fingertip. The Bluetooth model railway control app features patented Mesh technology, allowing multiple of locomotives to operate seamlessly without disconnection. This app is a game-changer for model railway enthusiasts and perfect for those due to start their model railway journey! The HM|DCC app is also incredibly user-friendly; the intuitive interface allows for easy operation, even for those who are not tech-savvy. The design ensures that users can quickly navigate and find the features they need to operate their locomotives without removing the model from the layout. HM7000 is 'backwards compatible' and it works in all the main scales worldwide: 1:87, 1:76. N scale and the newly-launched Hornby TT:120 scale. Importantly, this new system doesn't just work with Hornby model locomotives - it will also control locomotives made by other manufacturers. Benefits Precision Control Full control and programming via the free-to-download app available on iOS and Android Configuration Variables (CVs) can be changed without removing the model from the layout Precise control when shunting Manual braking option Driving wheel slip sound simulation on steam locomotives Motor control algorithm adjustments after auto-calibration Speed Easy to increase and decrease speed from start through to maximum acceleration Load compensation Creeping mode to allow precise coupling and uncoupling Shunting capability Realistic so unds Over 15 downloadable free sounds per profile Profiles available for diesel, electric, and steam locomotives Sound decoders fitted with Triplex sound capability allowing three sounds to be played at once e.g., horns, whistles, brakes or coal shovelling, wheel slip, injectors or any combination of three Ability to set the volume level for each sound individually or all at the same time Non-sound decoders also coming soon Lighting functions Decoders can be used to control additional lighting functions, if fitted to the locomotive Compatibility Fully compatible with existing Hornby DCC controllers Backwards compatible – select and fit the right decoder to experience the sights, sounds, control and speeds using the HM7000 system Conforms to all relevant NMRA standards in DCC operation ​​​​ Over 15 free unique Hornby sounds per profile download Choice of Bluetooth decoders with or without sound Review: Good Experience - I note some users report issues including defective units, luckily for me I have had a good outcome. Bought as my first sound decoder, I removed the basic dcc decoder I had fitted to my Bachman 3F 0-6-0 loco, and after realising I was trying to plug in upside down duh! added the Hornby module and plugged in the sugar cube speaker. I was using a Bachman dcc controller. Using iPhone the app installed, signed in and it quickly found the device on bluetooth. I created a profile and uploaded a photo of the Fowler 3F, run the updates to the firmware. I selected out the nearest steam loco profile for a 4F loco, and loaded it on took about 15-20min. Has worked brilliantly with intuitive controls has lots of fun. Selected the largest speaker box and superglued onto the weight plate in the tender, snug fit, coiled wire around box and the tender went back together. Sound quality excellent. Impressed with switch over between dcc manual control and bluetooth, works without issue. Its been 3 days no issues. Review: DCC Simplified - I have installed 2 of these and the associated Dongle and with current firmware (April 2024) everything is working as expected. The same for my HM7000-fitted TT:120 locomotive. I can only speculate why other users are having problems but it could be the result of poor installation. I have used Kapton tape to eliminate the possibility of contact with any live parts of the locomotive circuit. It could a be poor power supply. I use an old Hornby Elite controller but any standard DCC supply will work. It could be slow broadband. It takes me less than 10 minutes to change or update a profile. It could be dirty track as that always causes problems. It could be a lack of knowledge on how to set up DCC CV values. The app helps with this. I honestly do not know what it is. All I can say for certain is that HM7000 is working for me, and reliably so. The app is easy to use and gives the easiest way of setting up CV values that I have encountered, and I have used JMRI as well as my old Hornby Elite. The firmware is easy to update. The sound profiles are easy to update. It can take a bit of ingenuity to fit the optimum speaker enclosure but there are some good video examples from the usual online sources. There are better sound profiles out there and better synchronised steam "chuff" sounds, but at a price. You will have to decide if it is worth the extra cost. When properly installed and set up, the HM7000 decoders in my experience are excellent value. ## Features - Warning:Not suitable for children under 14 years. For use under adult supervision - Warning:Only for domestic use - Item Length 2.95cm - Item Height 1.55cm - Item Width 0.5cm - Item Weight 0.0025g ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0BV2HWGPB | | Batteries Required? | No | | Batteries included? | No | | Best Sellers Rank | 27,928 in Toys & Games ( See Top 100 in Toys & Games ) 2 in Model Train Transformers & Decoders | | Colour | White | | Customer Reviews | 4.4 4.4 out of 5 stars (103) | | Date First Available | 7 Feb. 2023 | | Educational Objective(s) | Enhance the reality and enjoyment of the railmodelers' hobby by learning and understanding the sounds and operations of real trains. | | Item model number | R7322 | | Manufacturer recommended age | 0 - 8 years | | Product Dimensions | 2.9 x 1 x 0.25 cm; 98 g | | tech_spec_battery_description_toys | No batteries required | ## Images ![21 pin sound decoder - Image 1](https://m.media-amazon.com/images/I/61dq2O4gGDL.jpg) ![21 pin sound decoder - Image 2](https://m.media-amazon.com/images/I/41zS4lOzYeL.jpg) ![21 pin sound decoder - Image 3](https://m.media-amazon.com/images/I/51JMSsAdHOL.jpg) ![21 pin sound decoder - Image 4](https://m.media-amazon.com/images/I/910BjLPwZKL.jpg) ![21 pin sound decoder - Image 5](https://m.media-amazon.com/images/I/91f0ucZeB-L.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good Experience *by A***C on 27 November 2024* I note some users report issues including defective units, luckily for me I have had a good outcome. Bought as my first sound decoder, I removed the basic dcc decoder I had fitted to my Bachman 3F 0-6-0 loco, and after realising I was trying to plug in upside down duh! added the Hornby module and plugged in the sugar cube speaker. I was using a Bachman dcc controller. Using iPhone the app installed, signed in and it quickly found the device on bluetooth. I created a profile and uploaded a photo of the Fowler 3F, run the updates to the firmware. I selected out the nearest steam loco profile for a 4F loco, and loaded it on took about 15-20min. Has worked brilliantly with intuitive controls has lots of fun. Selected the largest speaker box and superglued onto the weight plate in the tender, snug fit, coiled wire around box and the tender went back together. Sound quality excellent. Impressed with switch over between dcc manual control and bluetooth, works without issue. Its been 3 days no issues. ### ⭐⭐⭐⭐⭐ DCC Simplified *by D***S on 26 April 2024* I have installed 2 of these and the associated Dongle and with current firmware (April 2024) everything is working as expected. The same for my HM7000-fitted TT:120 locomotive. I can only speculate why other users are having problems but it could be the result of poor installation. I have used Kapton tape to eliminate the possibility of contact with any live parts of the locomotive circuit. It could a be poor power supply. I use an old Hornby Elite controller but any standard DCC supply will work. It could be slow broadband. It takes me less than 10 minutes to change or update a profile. It could be dirty track as that always causes problems. It could be a lack of knowledge on how to set up DCC CV values. The app helps with this. I honestly do not know what it is. All I can say for certain is that HM7000 is working for me, and reliably so. The app is easy to use and gives the easiest way of setting up CV values that I have encountered, and I have used JMRI as well as my old Hornby Elite. The firmware is easy to update. The sound profiles are easy to update. It can take a bit of ingenuity to fit the optimum speaker enclosure but there are some good video examples from the usual online sources. There are better sound profiles out there and better synchronised steam "chuff" sounds, but at a price. You will have to decide if it is worth the extra cost. When properly installed and set up, the HM7000 decoders in my experience are excellent value. ### ⭐⭐⭐⭐⭐ Great product *by P***. on 4 February 2025* A dcc decoder I had didn't work properly in my hornby 67007. I was recommended one of these by hornby. This decoder is absolutely brilliant. Easy to install the decoder and speaker in my particular locomotive. Can control on standard dcc controller or with the hornby app. I downloaded the sound files for my 67 and the variety of functions is brilliant and the sound is decent quality too out of the speaker. Better than older tts sound decoders. No need upgrade to any sound decoder that's more expensive - I am made up with this purchase and will look to buy more when I need to. Great product. ## Frequently Bought Together - Hornby R7322 HM7000-21TXS: Bluetooth® & DCC Sound Decoder (21-pin) - Hornby Accessories for 00 Gauge Track & Train Sets - Compatible with Select Hornby Model Trains, White - Hornby Hobby Train Tracks - HT8300 Straight Track Pieces x 4 168mm Track Pieces - Small Scale Model Accessories for Train, Electric Railroad Supplies with HO/OO Gauge Compatibility, Straight Tracks --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.es/products/512296597-21-pin-sound-decoder](https://www.desertcart.es/products/512296597-21-pin-sound-decoder) --- *Product available on Desertcart Spain* *Store origin: ES* *Last updated: 2026-05-17*