2Pcs Four-Way Remote Control Board Two-Way RC Transmitter and Receiver Toy Car Robot Model Accessories,DIY Toys Projects Four-Way Remote Control Remote and App Controlled Vehicles Accessories,27mhz

These worked really good for about a week, then just stopped working.

Interestingly, online info about this system is not as readily available as I thought it would be. The voltage supply required is 3.3V for both the receiver and transmitter, and the red and black wires are power on both modules. Each of the colored wires corresponds to one of the buttons on the transmitter. I connected this quickly on a bread board with a few LEDs to test, and it worked great. Note, it doesn’t come with an antenna on the transmitter. I tested with both no antenna, and a short wire attached, and it worked fine both ways. A fun little gadget. 5 stars.

This came without any documentation/instructions at all (just the two boards in a plastic envelope) so I don't even know what voltages to apply to the positive/negative leads. I sent the seller a request for information but have not received a response. Would caution anyone buying this that unless you have your own source for information for these boards its probably best to steer clear of them. The price is really good so if someone can figure it out then its probably an excellent buy.