CACAZI FA50 1 For 1 Push-button Self-generating Wireless Doorbell, Plug:US Plug 1. Material: ABS, electronic components 2. Remote control distance: 150 meters 3. Built-in music: 60 songs 4. Volume: 5-speed adjustment 5. Working principle: The transmitter is installed outside the door, the receiver is installed on the power socket, press the transmitter to ring the bell, the receiver immediately rings and flashes to remind 6. The doorbell has 60 built-in chord music, you can choose according to your preference 7. Strong penetration, the straight-line distance on the open space can reach 150 meters (note: the actual use effect varies depending on the environment, and the signal receiving effect is also different due to different obstacles) 8. Dimensions: Transmitter: 8.6 x 8.6 x 2.2 cm, Receiver: 9 x 5.6 x 2 cm Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Minnanxin