Light-weight and easy to handle with 92mm x 41mm viewing area ,Replaceable and rechargeable Li-ion battery 7.4V/52mAh. Charging time: 5 hours ,Best in class Reusable TH3 P R SL filter (NPF 500) with only 0.2% inward leakage and increased surface area for longer filtration lifetime ,Min 17 lpm for 8 hours ,Noise level 75dBA