Feature: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 DoorbellMaterial: ABSTransmitter Battery Model: 23A 12V Alkaline Battery x1(Ship with Inbuilt Battery)Battery Capacity: 60mAhReceiver Battery Type: 1.5V AA Battery x2(Battery Not Included)Use: Perfect for Large Homes, Apartments, Offices and Classrooms.Package List:1 x Transmitter (Ship with Inbuilt Battery)1 x Receiver (Battery Not Included)1 x Battery