. PRODUCT SPECIFICATION 2.1 Scope of Remote Keyless Entry in BCM system. 21.1 Key part : TRANSMITTER is inside of the remote key, and it sends the rolling code to the RECEIVER by radio frequency. 2.1.2 RECEIVER : It receives the rolling code and decodes that, thereafter RECEIVER drives the actuator. 2.2 Specification 2.2.1 TRANSMITTER 2.2.2 ITEM SPECIFICATION Rated supply voltage DC 3V Operating voltage range DC 2.5 ~ 3.