... /1 root, 5m/1 root ,Installation fittings/1 set;It is allowed to choose W type controller,at ... root,(4)Controller:N type, inside installation,control 1 set light curtain,the powersource is AC220V/110V(terminals) ... or DC24V; W type, outside installation,control 1 set light curtain,the power source is AC220V/110V(switch ... be made on order; Cost-effective safety device,light barrier sensor SNB3230