esse ti intercom 2w active speaker unit 117x64x19mm 5hv 300Esse ti 2W Speaker Unit (5HV 300) for Lift Intercom Systems The Esse ti 5HV 300 is an active 2 wire digital speaker unit for Esse ti 2W lift alarm systems, designed for installation behind the lift car operating panel. It delivers clear two way hands free emergency communication with low power consumption over a simple 2 wire BUS. Key features Active 2 wire digital BUS speaker unit (approx. 117 x 64 x 19 mm) Powered by the autodialler over the BUS, or