Material: Electronic Components Color: See pictures Signal Frequency: 27MHz 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 Item specifics:Use: UniversalWireless communication: RFModel number: GUGUJI222