Features: 1.STRONG PENETRATION: Wireless doorbell's wireless signal has strong penetration, it can easily pass through all kinds of doors or wall, so you won't miss any visitors. 2.WATERPROOF AND DUSTPROOF: Portable doorbell reaches IP44 weatherproof rating, suitable for outdoor use, and can withstand all kinds of harsh weather conditions. 3.36 RINGTONE: Wireless doorbell has 36 ringtone, you can set different ringtones in different places, perfect for large houses, apartments, offices and classrooms. 4.WITH LED INDICATOR: Wireless button doorbell with LED indicator, the doorbell rings and the LED blinks to notify you visually, which is an excellent feature for the hearing impaired. 5.BATTERY POWERED: The Doorbell is battery powered, ultra low power design, energy saving sustainable utilization, you do not need to replace the battery frequently. specification:Item Type: Wireless Doorbell Material: ABS Transmitter Battery Model: 23A 12V Alkaline Battery x1(Ship with Inbuilt Battery) Battery Capacity: 60mAh Receiver Battery Type: 1.5V AA Battery x2(Battery Not Included) Use: Perfect for Large Homes, Apartments, Offices and Classrooms PackageList: 1 x Transmitter (Ship with Inbuilt Battery) 1 x Receiver (Battery Not Included) 1 x Battery