Fanvil KT20 Wireless Button

The durable Fanvil KT20 Wireless Key/Button for Y501/Y501-Y is a rebound-type
kinetic energy wireless key. It uses patented micro-energy harvesting
technology, does not require a battery, and is extremely small in size. This
wireless key can be paired with the Fanvil Y501/Y501-Y series and X305 Big
Button IP Phone
[https://shop.ntsdirect.com/product/X305-Z/Fanvil-X305-WHITE-BIG-BUTTON-PHONE.html?cid=110] for
equipment control.