Corui Smart Wireless A10 Doorbell Button US EU UK AU Plug Digital Music Intercom Door Bell Waterproof Smart Home Remote Calling Description: Color: White Type: Doorbells DIY Supplies: Electrical Doorbell Type: Wireless Power Source: AC,Battery Power supply: 110V-220V-240V Working frequency: 433MHZ Ring Tone: 36 ring tones Waterproof : yes Transmitter size:74mm X 50mm X18mm Receiver size:95mm x 65mm x 24mm Battery mode: 12v 23A battery Note: Battery is not included. Receiving distance: 300M Remote (in open area) Specifications: Features: -The transmitter is waterproof but receivers not. -The transmitter without screw chuck design to achieve waterproof and dustproof. -Double-sided stability of the PCB, the chip standby sleep up to micro-level. -The transmitter 12V23A battery factory pre-installed Note: Battery is not included. -The use of microprocessor control, double-sided PCB micro-power design. -Use of premises: Home office villa hospital school factory. Package Included: 1 x Receiver , 2x Transmitter 1 x Double faced adhesive tape , 1 x Sticker 1 x Screws , 1 x Instructions