Easy to
Install & Widely Compatible: The doorbell extender is easy to install; Power cables can be connected either way; Operating voltage is 3-24V; Use a transformer if voltage exceeds 24V; Compatible with mechanical doorbells, wired doorbells
Wireless Expandable System: Supports simultaneous multi-transmitter operation (front/rear door), expandable up to 20 units; Receiver can be configured according to the size of the usage range and is suitable for homes/apartments/gardens/estates