Both kits easily retrofit to existing installations* and include replaceable battery. The fobs float and are waterproof. Both kits include a receiver that supports up to eight remote key fobs. (additional fobs sold separately). FCC & CE.*The new wireless remote control may be retrofit to any windlass/thruster with a dual direction solenoid - Not a toggle switch.3 Button Wireless Remote Kit: Allows wireless remote operation (Up/Down) of any Lewmar or Simpson Lawrence (solenoid switched) windlass. Kit includes one wireless fob and one receiver.5 Button Windlass and Thruster Wireless Remote Kit:Allows wireless operation of any Lewmar or Simpson Lawrence (solenoid switched) windlass (up/down) & thruster. Kit includes one wireless fob, one thruster receiver & one windlass receiver.