Charge cell phones and other devices with USB connectivity using solar power
RIDATA Model SP 3900 photovoltaic solar powered battery charger accommodates cell phones and any electronic device that has USB connectivity. Ideal for MP3 players, PDAs, GPS units, hand-held games, radios, and more. Features a 900mA power bank. The 3-panel SP 3900 fully charges a cell phone or electronic device in direct sunlight in approximately 4 hrs. Also available is Model SP 1300 solar powered battery charger. SP 1300 fully charges 2 AAA batteries in about 5 hrs. or 2 AAs in 10 hrs. Lightweight, waterproof unit charges on cloudy days, but not as quickly.