This Rothco 36-Bulb LED Solar/Handcrank Lantern Size - 10.25 inches x 4.35 inches Hand cranking for 1 minute provides: 20 mins using 18 led mode, 10 mins using 36 led mode 8.5 hours solar charging, provides 2 hours normal lighting, alternate power - handcrank with rechargeable battery, Keep one of these hand-crank lanterns on hand and you will have a dependable light source regardless of what mother nature may bring. This 36 bulb lantern is capable of being charged by either its hand crank or its integrated solar panel. This means you can charge it all day and have light at night or, in an emergency, crank the dynamo handle and generate the power you need. Just 1 minute of hand cranking provides 20 minutes of power in 18 LED mode and 10 minutes in the brighter 36 LED mode. 8.5 hours of solar charge will provide up to 2 hours of normal lighting. Features a 2 function on/off switch to change between 18 and 36 LED mode.