Wireless Self-powered Doorbell Transmitter with Receiver Unique Sliding Button

Features:*Energy-saving: The transmitter is self-powered, no batteries needed. Converting the energy from finger pressing into electricity, then transmit wireless signal.*Personalized Your Own Doorbell: Swipe your finger and chose what you like, 58 melodies optional, and 4 levels volume adjustment.*10 Years Long Lifetime: The outdoor transmitter has padded the pressing test more than 200000 times, which ensure your long time use.*Strong Signal Receiving and Penetrating Power: Up to 180m powerful transmitter distance in open area.*Rainproof: Doorbell can be installed outdoors, do not worry about being drenched by rain.Common