ITEM NAME:2CH Remote Control 27MHZ Channel Radio Module Transmitter Receiver Board Antenna 100% brand new and high quality Material: Electronic Components Color: See pictures Signal Frequency: 27MHz Operating voltage: 3V Using: This module can use for one motor go and back. Use Tips: Multiple sets of the same frequency remote control device, can not play at same time. This module can not use high power motor, it will burn the board. Dimensions: (L*W) Transmitter board: 4*3.7cm/1.57"*1.46" Receiver Board: 3.7*2.4cm/1.46"*0.94" No Retail Packages Quantity: 1Pc Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! 1 Pc x 2CH Remote Control 27MHZ Radio Channel Module Transmitter Receiver Board Antenna.Signal Frequency: 27MHz. Transmitter board: 4 3.7cm/1.57" 1.46". This module can not use high power motor, it will burn the board. Using: This module can use for one motor go and back. Receiver Board: 3.7 2.4cm/1.46" 0.94".