The BOLT solar charger is your perfect companion, keeping you online and in-touch on the GO. Built in battery and two rotating solar panels, the BOLT charges popular USB powered gadgets from your Smartphone and MP3 player to GPS and camera. Long life internal 3.7V/2000mAh Li-Poly battery. Size: 4.7 x 1.3 x 2.5in. Weight: 4.8 oz.