1. Wind up 1 minute can support light for 30 minutes 2. Winp up 2-3 min will support mobile phone talking for up to 8 min 3. Revolutionary self-powered technology never needs battery replacement 4. Recharge the battery simply by winding the handle. 5. Super bright LED that never need replacement. 6. Ergonomic rubber grip handle 7. Great for power failure, emergency, camping and more 8. Product Size: 13.9*5.8*5.1 (cm ) Package: 30 PCS / CTN G.W / N.W: 9.1kg / 6.8 kg CTN SIZE: 42*37*30 (cm)