My store，ur best shopping choice.Features:100% Brand New.Wireless system.Super long receiving distance.Environment friendly energy saving system. 100 Meter Wireless Door BellEasy to installWaterproof remote button light up when pressedRemote button has double sided adhesive on the back of itBuilt in double speakers， makes the bell sound more clearTwo digital receiversIdeal for house， office， etcSpecifications:Digital receiver size: 93*60*21mm Emitter size: 70*39*10mmInstructionsPress the small gap on the underside of the remote control with a flat screwdriver.Open the remote and insert the 12V battery (small battery， not included).Close the remote again and then stick it where you want with the adhesive back.Insert the 2 * AA batteries (not included) into the receiver.Use the button on the side of the receiver to change the melody to your favorite. Package Content:1 x Emitter(Batteries are not included)2x Receivers(Batteries are not included)Love needs courage，shopping too.