https://www.yealink.com/upfiles/products/datasheet/Yealink-WH62-Datasheet-V1.0.pdf

Yealink WH62-DUAL-UC, WH62 Dual/Mono, DECT Wireless Headset, Arm Adjustable: 320°, 2xMicro USB Port, Talking Time: upto 14h (Dual)/13h, Wireless range: upto 160m (Mono), 1 Year Warranty