Description: This item comes with 2 doorbell receiver chimes and one remote controlled button transmitter for your convenience, and long remote range of 300 meters in open air ensures you to hear the bell and answer the door in time. High-quality voice processing technology integrate with 55 tunes for your preference. The doorbell is applicable for home, apartment, hotels, office and other places. Get one to make your life easier and safer Features - Remote range of 300 meters in open air, which makes it easier to hear the doorbell wherever you are in your home, you can take the transmitter throughout your home and won't miss a visitor's arrival. - Expandable and DIY pairing.You can DIY by pairing additional receivers and push buttons to meet your requirement. Each push button transmitter can pair one or multiple receivers. - Multi-functional. There are 55 Chime tones with 5 levels volume adjustment for options to delivers rich and crisp sound. - The push button is rated IP55 waterproof to meet the needs of different environments. - Easy to use. Simply plug the door chime into a power supply. No any wire or battery required. - If a visitor enters, the LED of the receiver will regular flashes along with the music. LED light will flash according to the rhythm of music. - Great for commercial places, factories, hotels and offices, also work well for large homes or villas, etc. - Energy saving and eco-friendly design, the push button transmitter can last for 25 year (5 presses per day). Specifications: - Color: Black - Material: Plastic - Size (Receiver): Approx. 8.2 x 8.2 x 5.5 cm/ 3.2 x 3.2 x 2.16 inch (L x W x H). - Size (Transmitter): Approx. 3.2 x 2 x 7.3 cm/ 1.25 x 0.78 x 2.87 inch (L x W x H). - Voltage of Plug-in Receiver: 110-260V / 50-60Hz - Battery of Transmitter: 1 x 12V 23A Alkaline Battery - Item Name: Wireless Doorbell - Ringtone: 55 Melodies (Optional) - Wireless Distance: 300M in oOpen air - Sound Volum: 5 Levels, 25-100dB - Silent Mode: Support - Transmitter Waterproof Level: IP55 - Working Frequency: 433.92MHz280KHz - Working Temperature: -30~+70 Package Included: 1 TO 11X Receiver 1X Button 1X User Manual 2 TO 11X Receiver 2X Button 1X User Manual 2 TO 12X Receiver 1X Button 1X User Manual