The trail runner free 2 ultra makes life simple with its free technology this innovative design integrates the power cord into the headband to eliminate tangles. Long battery life is assured with the help of multiple charging options found in the included hybrid battery case use either the rechargeable 4.0 ah long distance battery for extended runs or 3 x aaa batteries as a backup. Quality of life features include a secure anti slip headband and ipx5 water resistant design, ensure it's ready for any trail. Whether you're going far or fast, the trail runner free 2 ultra is your ultimate running companion. 550 lumen outputfree technology headband and connection systemsilva intelligent light combining long reach spot light and a close flood lightcomfortable fit thanks to low weight and anti slip headbandred rear safety light built into hybrid battery caseflat, soft textile extension cordwater resistant ipx5 standardmax mode indicationhybrid battery case includedbattery 4.0 ah 14.8 wh rechargeable battery li ion 3.7v 4.0ah 14.8wh 3xaaa compatiblebattery indication 4 red, green ledsbattery weight 85g 3ozweight incl. Battery 145g 5.1ozcharge time 5 hourslight modes distance feet, distance metres, lumensmax mode 550 lm 4.5 7 h burn time 80 m 264 ft light distancemed mode 200 lm 10 14 h burn time 50 m 164 ft light distancemin mode 50 lm 18.5 23.5 h burn time 27 m 89 ft light distance