USL-Entry - UniFi Entry Sensor
SuperLink sensor with up to 6-year battery life for monitoring door and window open/closed status.
The UniFi SuperLink Entry Sensor (USL-Entry) is a high-performance, long-range door and window sensor designed for the UniFi Protect ecosystem.
It uses Ubiquiti’s proprietary SuperLink (sub-GHz) protocol to provide significantly better range and battery life compared to standard Bluetooth sensors.