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Why you like to buy? This wireless doorbell is different from those powered by battery, no need to replace battery time to time. How does it works? When you push the button of transmitter, it converts kinetic energy into an electrical signal that makes the receiver rings or flashing. Due to the waterproof coating and ABS plastic material, this wireless doorbell is waterproof and flameresistant. As a result, this weatherproof doorbell has longer life span for use. The doorbell can be setted up in mute mode, so as to ensure your good sleeping. It has 3 adjustable volumes, the highest volume is super loud, which benefits individuals with hard hearing. However, plese be note that deaf people can only depend on the flashing stroke. If you want 2 or more transmitters/receivers, please contact us to purchase and get install instruction. Attention: *Please run a test before installation. *Do not install transmitter on UPVC door frame or metal surface. *Avoid locating Transmitter/Receiver on or directly near metallic surface as this may reduce the operation range. *Please always check the product manual before final installation. Specifications: *Power supply: Receiver/AC 100-240V &Transmitter/Self-powered. *Operating Temperature: Receiver/-10℃ to +40℃ & Transmitter/-20℃ to+50℃ *RF Frequency: 433MHz. *Waterproof:Yes *Net Weight: Receiver/53g & Transmitter/55g *Power Consumption: Receiver/