Feature: 1. Solar Powered: The wireless infrared doorbell comes with a receiver and two motion detectors that are powered by solar energy. This eco friendly feature ensures continuous operation without the need for frequent battery replacements. 2. Wide Acceptance Range: The wireless doorbell has a reception distance of 200 to 300 meters, with low sensitivity ranging from 5 to 8 meters, medium sensitivity ranging from 8 to 12 meters, and high sensitivity ranging from 13 to 16 meters. 3. Easy Installation: This wireless doorbell requires no complex wiring or complicated installation. The motion sensor can be easily mounted on the wall, and you can place the wireless motion sensors and alarm receiver anywhere you prefer. 4. Multi Functionality: This doorbell can be used as a car alarm (internal), warehouse monitor, supply cabinet alarm, garage and tool shed monitor, mailbox sensor, or front door, sidewalk detector, catering to various surveillance and security needs. 5. Wide Application Range: Suitable for homes, offices, shops, hotels, or other buildings, this compact and discreet wireless doorbell is difficult to detect. It provides advance warning when guests or intruders approach, ensuring added security and peace of mind. Specification: Item Type: Wireless Doorbell Material: ABS Weight: Approx. 490g/17.3oz Receiving Distance: 200 to 300 meters Low Sensitivity: 5 to 8 m Medium Sensitivity: 8 to 12 m High Sensitivity: 13 to 16 m Operating Band: 433MHz FSK Detection Angle: 120 degree Battery Type: 472540 polymer battery 500mAh (included) Solar Panel Specifications: Monocrystalline silicon 5.5V 100mA Music: 38 songs Volume: Four gear volume adjustment (high, medium, low and mute). Package List: 2 x Motion Sensor Detector1 x Receiver2 x Bracket 1 x Specification 10 x Screw 10 x Expansion Tube 1 x Card Pin