Linbell Portable Plug-in Wireless Self-generating Doorbell with 25 Chimes Waterproof and Push Button 1 Receiver 1 Transimitter White Self-generation For the Bell Buttons. Wireless Connection From Receiver and Transimitter. In Mute Mode the Led Will Flash With Unique One-key Mute Function. Remote Control Range Can be Up to 100 Meters. Full Water-Proof to Avoid Raining & Waters. Utlra-low Power Consumption and 200,000 Long Using Time Will Accompany You for 20 Years. 25 Different Ringtones, Three Level of Adjustable Volume.