* Features:1) Lines grace, light touch button, various kinds of colors for your choice, can bring you a sense of vision enjoy from lines and colors.2) Simple, vivid and no-wire installation design avoid troubles and save money when in installation and don't effect decorate environment.3) Remote control range up to 100meters in open air, suitable for homes and high floor houses.4) Build in anti-interference design, avoid the interference between users.5) Build in double speakers, make sound clear, especially suitable for homes, offices, factories, hotels, etc.* Installation:The button the doorbell apply the same encoding-decoding codes (please refer to the codes on the plastic shells). The button adopts a piece of 12V 23A Battery. Fix the button on the wall near the door with screw, glass glue or dual-side sponge adhesive paper. Please keep away from rainwater. It should not be placed on metal surfaces. The battery's longevity is up to one year with 20 times presses per day. Please replace the Battery if the doorbell is out of order after using for period of time.** Just plug the Receiver into the outlet indoor for usage.** Insert two pieces of 1.5V AA Batteries into the slot of the Receiver and place it at any location.