XCSOURCE Premium Portable Wireless Remote Doorbell With 38 Songs Alarms Easy Install For Home, Office, Hotel, Everywhere HS103 38 Songs Wireless Musical Doorbells w/ Remote Control. Press the buttion on the side of the door bell to change songs. 38 songs for choosing, when the doorbell rings the indicator flashes as well. Press the remote control button to trigger the wireless receiver doorbell to chime. No obstruction wirless working distance up to 100 meters and up to 20 meters while obstructions exist.