BER-TRV2's receiver BER-RXV2 doesn't need extra external sensor because it intergraded the voltage data collector. It can be directly linked to the rc cars' or boats' power to test the voltage changes immediately,thus, making it convenient for installment.In addition,you can read the voltage value in the LED display screen.

Specifications:
● size:190 x 155 x100mm
● weight:300g
● transmit frequency:2.4GHz ISM
● operating voltage:4.0--8.8V
● operating channel:208
● suitable battery(not included):4 x dry cells/NiMH battery
● remote control distance:as far as 500m

Package Included:
● 1 no 2.4G BER-TRV2 transmitter
● 1 no 3-channel BER-RXV2 2.4G receiver
● 2 nos Battery balance connector to servo connector conversion cables