1. DOORBELL KIT: Self-powered wireless doorbell, no battery or connecting cable required to avoid the problem of the doorbell not ringing. 2. SPEAKER: The wireless doorbell is equipped with a speaker that covers an area of 200 m² and is versatile. 3. WORKING PRINCIPLE: Built-in power generation module, when the button is pressed, it automatically converts into electrical energy and sends out a wireless signal. 4. EASY INSTALLATION: Equipped with screws and a sticker on the back, the wireless doorbell is easy to install and remove and suitable for home use. 5. ABS HOUSING: The doorbell housing is made of high-quality ABS with good toughness, corrosion resistance, and oxidation resistance. Specifications Item Type: Wireless Doorbell Material: ABS Color: White Weight: Approx. 111g Package Contents 1 x Doorbell 1 x Receiver 1 x Back Sticker 1 x English User Manual 2 x Screws 2 x Expansion Screws