Music type- Gayatri Mantra, Musical Door bell, Voltage- 240V AC, 50 Hz, Works on AA Pencil Battery The compact body and wireless feature make this Door bell easy to install and maintain. This doorbell is made with high quality material with an elegant design that makes the product durable and stylish. High Frequency range, Strereophonic Crisp Sound, Energy Saving Sonic Doorbell operates with 2 AA Battery, which can work even if there is no electricity.