Description： Door Bells & Chimes New Home Welcome Doorbell Intelligent Wireless Waterproof Doorbell 300M Remote Home Welcome Doorbell Intelligent Wireless Waterproof Doorbell 300M RemoteThe product is shlpped based on the color or size of the main image of the product page, if you have special requirements, please leave us a message. EMASIFF Home Welcome Doorbell Intelligent Wireless Doorbell Waterproof 300M RemoteFeatures:38 ringtones to choose from and 3-step volume control (0~85dB). Eye-catching backlight flashes when someone pushes the doorbell. Particularly suitable for the elderly, deaf, and children. Uses machine-learning to prevent interference from other wireless transmitters. Designed to last up to 25 years. Specifications:Working frequency: 433 MHzReceiving distance: 300M(in open area)Transmitter size: 75 x 51 x 20 mmReceiver size: 95 x 65 x 24 mmReceivers Rated voltage : AC 110V-220V -240V? V?? The transmitter 12V23A battery factory pre-installed (battery not included)Package Included:1 Black transmitter and 1 Black receiver