Battery Operated Doorbell - Battery powered, no outlet required: runs on 3 AAA batteries (included) for convenient placement without wiring. - Flexible placement options: the receiver can be wall-mounted with screws or stood on a desk for easy setup. - Portable use: take the doorbell to the backyard, basement, garage, or bedroom for versatile coverage. - Touch button wireless design: IP44 dustproof and waterproof rating, high sensitivity, and low energy consumption for reliable indoor or outdoor use. - Visual alert for accessibility: includes a large built-in LED indicator to assist users with hearing impairment. - Rich alarm options: 36 melodies and 4 volume levels (mute, low, middle, high) to suit any environment. - Long operating range: up to 1000 ft in open area with a strong wireless signal that minimizes interference with other devices at home or neighboring homes. - Easy installation: insert 3 AAA batteries into the receiver and fix the transmitter to the door frame by pulling out the insulating sheet. Do not install too close to metal surfaces or electronics such as televisions.