ITEM NAME:4CH 27MHZ Receiver Transmitter Board with Antenna Module DIY Accessories .like-pro-float .like-pro-price-both{clear: both;.Electronic frequency: 27MHZ. Transmitter: Approx. 4 Pieces Transmitter Board. 8 Pieces Antenna. 4 Pieces Receiver Board. Receiver: Approx. People always bought together with.