Home Security Wireless Door Bell-1 Door Bell 2 Remote Control Features 38 Music Brand new Home Security Wireless Door Bell-1 Door Bell 2 Remote Control Wireless system. 80m 4D remote control distance, 38 tune songs for selection. Easy for installation, Environment friendly energy saving system. Remote controller can be powered by 23A 12V battery(not included). You can enjoy the music from VOYE in your space and share the happiness of knowing the arrival of your friends.