... ice or refrigeration colloid, using air as cooling medium, Foldable and washable,military qualitySummer Air-cooled/ Air-condition Waistcoat/Vest=Specifications=1.Internal ... (M size, not including the small fans)4.Supply Power: Lithium-ion battery,Model 18650, 3 batteries.5.Battery ... height X depth)4).Weight:265g5).Work voltage:12V6).Fan power: 3.5W 2 Fans1 Grade2 Grade3 GradeAirflow200L/min320L/min400L ...