Waterproof Wireless Self-Powered Doorbell with self-generating button (no battery needed), long-range wireless coverage up to 150m, strong wall penetration, 58 ringtones, 4 volume levels, 4 smart modes (ring/light/silent) and intelligent memory. Pair 1 button with up to 10 receivers and set different ringtones for different doors—ideal for home, office, or shop.