A stylish, electronic time delay slave for lighting and use in conjunction with Elkay 2 wire or 3 wire Master switches only, the push button slave can replace an existing switch to provide energy saving functionality by working in conjunction with Master timers that can time lighting and power sources off to avoid unnecessary power usage. Key Features: –– Slave for use with Master timers only to enable multiple point switching –– Backlit blue neon indicator ring available for aiding location in the dark. –– Concealed fixing screws