The Rocky Talkie Mountain Radio is an award-winning license-free radio designed and tested in the Colorado Rockies. Created with climbers and skiers in mind, the compact radio is suited for any rugged adventure where communication is critical. A specialized lithium-ion battery provides over 4 days of battery life, even in very cold conditions (-20AdegF). For enhanced durability, the radio has a shatterproof LED screen and thermoplastic protective covering. Unlike the fragile plastic clips of other radios, the Mountain Radio easily secures to backpacks and harnesses using an ultra-light carabiner and back-up leash. The radio transmits the maximum power legally allowed for use without a license (2-watts). The max range is over 35 miles, however, 1 to 5 miles is more typical in backcountry terrain. For more info on range, please see Rocky Talkie&';s range testing video or blog post.The Mountain Radio is ready to use out of the box and requires zero configuration. The electronics are simple and reliable - the radio has 5 buttons that are easy to understand while still supporting the critical advanced features (such as privacy codes to prevent outside interference).2-year warranty. Specs Radio Service FRS (no license required) Channels 128 Privacy Codes 121 (CTCSS and DCS) Range Line-of-sight: 35+ milesMountains: 1 to 5 milesForest/Hills: 0.5 to 3 milesCity: Up to 1 mile Power 2 Watt Features Privacy Codes, Channel Lock, High/Low Power Modes, Scan Mode, Roger Beep Waterproofing IP56 (Splashproof/Snowproof, not submergible) Battery Type Rechargable 1550 mAh Li-ion Radio Body Dimensions 9.3 cm tall x 6.3 cm wide x 2.8 cm thick Weight Radio Only: 6.1oz, with leash: 7.9 oz Operating Temperature -20Adeg to 120Adeg F Charging Temperature 10Adeg to 100Adeg F Charging Type USB-C (Charging cable included) Headset Port K1 (dual pin 3.5mm-2.5mm) type Antenna 7.5cm, non-removable