Yealink Business HD IP DECT Cordless Handset + Base Unit Up to 4 simultaneous external calls, Expandable up to 5 DECT cordless handsets for one base unit. Up to 30 hours talk time, Up to 400 hours standby time. Quick charging: 10 mins charge time for 2 hours talk time. 3-way conferencing, Indoor Range: 20m~50m, Outdoor Range: 300m. Developed to enhance communication for on-the-go workers in various industries such as warehousing, catering and retailing. Featuring a big 2.4-inch color screen