The SolarWorld solar charger recharges (1) AA or AAA battery. The built-in clip attaches to your car visor, belt, hat, backpack etc., or use the included suction cup to attach the Solar World charger to your home or car window. It weighs less than oz.! This makes it great for backpacking and keeping your flashlights and other gadgets powered up. It is the perfect companion to our Sierra Wood Burning Backpacking Stoves as well. Measures 2 3/4″ x 2 1/2″ x 1/2″, and weighs 0.8 oz.