Without question, everyone you know needs to have one of these brilliantly compact 4-in-1 emergency radios! They are small and multifunctional with an AM/FM radio, dual function torch, emergency siren and USB charger. Perfect for the car, RV, to keep at home, or to take camping or hiking! The device is powered by an internal lithium polymer (LiPo) battery via USB and should get up to 5 hours of use on a full charge (see product specifications for more info). However, in an emergency, the unit can also be charged by hand cranking the dynamo which should provide over ten minutes of radio or torch functionality, or two minutes of siren. This can be extremely useful in situations where you are outdoors or otherwise out of power and are unable to charge the unit fully. The built-in torch has two modes: a single 0.5W LED option or dual high brightness LEDs so you can choose which level of brightness you need. Perhaps the most useful feature is that it has a USB port so you Hand Crank Emergency radio with torch, siren and USB charger Internal Lithium Polymer (LiPo) Battery with Dynamo Crank Power Backup FM Frequency Range : 88.0mHz, 108.0mHz MW(AM) Frequency Range : 522.0kHz, 1620.0kHz Dual-Function Torch: Light Output: 30 lumens (0.5W LED), 6 lumens (Dual High Brightness LED) Emergency Siren Output: 120dB Battery: 3.7V 480mAh LiPo USB Charge Time: Approx 2hrs Approx. Working Time on full charge: 0.5W LED: 4hrs, Dual LED: 10hrs, Radio: 5hrs, Siren: 70min Dimensions: Length : 158.0mm, Width : 50.0mm, Depth : 33.0mm Weight : 171.0g DC Voltage : 5.0V DC Max current : 0.0A