Up to 300-meter line-of-sight range (an incredible 900-meters in some conditions). Between 8 and 12 hours talking time. Encrypted transmissions. High sound quality. Lightweight, compact. Single 2.5mm port on device allows for wide range of personal mic/earpiece preferences (32 Ohm), however, a dual-jack (3.5mm and 2.5mm) Yapalong headset is recommended. Up to 8 talkers and an unlimited number of listeners with paired Yapalongs. Warranty Period Yapalong4000 unit – 1 year from date of purchase, covers manufacturing defects and product failure under normal usage, following instructions as described in user guide. Button colors may vary.