Solar power supply makes the transmitter energy-efficient and durable. Two plug types allow you to choose the suitable one based on your needs. The 4-level volume adjustment enables customization according to preference. IP65 waterproof rating ensures reliable and practical performance. Constructed from ABS material for enhanced durability. Receiver dimensions: 8.5cm x 8.5cm x 2.6cm / 3.35" x 3.35" x 1.02" (Approx.). Transmitter dimensions: 8cm x 5.9cm x 4.5cm / 3.15" x 2.32" x 1.77" (Approx.). Suitable for home use as well as passageways, restaurants, stores, hotels, and other commercial spaces. One transmitter can be paired with multiple receivers, and one receiver can be paired with multiple transmitters. Features 4-gear volume adjustment, including silent mode. Item Name: Home Wireless Doorbell Material: ABS Color: White, Black Working Distance: Up to 300 meters in open areas Music Options: 52 melodies Receiver Power: Plug-in Receiver Power Consumption: 60mA (working), 7mA (standby) Receiver Voltage: 90V260V Receiver Plug Types: US Plug, EU Plug Transmitter Voltage: 3.7V Power Source: Solar-powered with 150mAh battery (included) Water Resistance: IP65 rated Volume Range: 2580dB (4-level cyclic adjustment) Features: High sensitivity, easy setup, wide application Note: Due to lighting and screen setting differences, the actual item color may vary slightly from images. Slight dimensional variations may occur due to manual measurement. Instructions: 1. Plug the receiver into the socket, press the volume button for 6 seconds until the blue LED stays on. Press the transmitter button. When the receivers blue LED flashes, pairing is successful. 2. Pairing will fail if not completed within 6 seconds. 3. One transmitter can pair with multiple receivers and vice versa. Device retains pairing memory after power loss. Package Includes: 1 x Receiver 1 x Transmitter 1 x User Manual