Product: Door Bell Connectivity: Wireless Battery Required: 1.5, AA 32 melodies music for option 100m operating range(in open area) Easy to install, No electrical wires to install Suitable for Hard of Hearing with Strobe feature Low power consumption General Product: Door Bell Connectivity: Wireless Battery Required: 1.5, AA Suitable for homes, office and other place to install 32 melodies music for option 100m operating range(in open area) Easy to install, No electrical wires to install Suitable for Hard of Hearing with Strobe feature Low power consumption Brand other SKU OT776EL03GG0KNAFAMZ-249496