1 x Doorbell Push Button Transmitter + 1 x Wireless Doorbell + 1 Battery Pack For Trigger Push Button Included In The Pack. Does Not Require To Be Attached To Electric Points, Works On Batteries, You Can Install The Remote Buttons In One Location. Such As Front Door Or Back Door. Flash Light Turns On When Guest Presses The Remote Button. Double Side Stickers At The Back Side Of The Remote Button. Very Easy To Install. The Ultra-Distance Remote Control (30 Meters Long) Meets The Need Of Various Buildings