supply of master/slave telehone & power supply systemmaster/slave telehone & power supply system,supply and transportation of slave telephone suitable for ofc based gate communication sy stem. latest rdso specification no. rdso/spn/tc/51/2021 rev.1. make/brand- bentrone or similar. [ warr anty period: 30 months after the date of delivery ] ] , supply and transportation of gate telephone (slave telephone) for electronic lc ga te telephone system rdso spn tc 51/2011 latest 1.0. make/brand- bentron power system or similar. [ warranty period: 30 months after the date of delivery ] ] , supply and transportation of ofc based master telephone unit for 6 code electronic lc gate communication system with voice recording facility complying to latest rdso specification no. rdso/spn/t c/51/2021 rev.1. make/brand- bentrone or similar. [ warranty period: 30 months after the date of deliver y ] ] , supply and transportation of power supply system with mf battery(battery warranty minimu m 24months) of 12v/24v dc (12v dc supply shall be connected to the station telephone unit & 24v shall b e fed to line circuit) with maintenance free battery for electronic lc gate telephone system.,supply of pow er supply system with mf battery of 12v/24v dc (12v dc supply shall be connected to the station telepho ne unit & 24v shall be fed to line circuit) with maintenance free battery for electronic lc gate telephone s ystem. make/brand- bentron power system or similar. [ warranty period: 24 months after the date of deli very ] ] , supply and transportation of 12 volt power supply unit with rechargeable mf battery(12 volt /7 ah)minimum). make/brand- bentrone or similar. [ warranty period: 24 months after the date of deliver y ] ]