Note: This item is ONLY for 220-240V, not for 110V. Please confirm the voltage of your area before placing an order. 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. 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 (Included) - 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: 433.92MHz plusmn;280KHz - Working Temperature: -30~+70