Frequently Asked Questions: 1) Is the Solar Backpack weather resistant? To keep the integrity of the speakers it is not recommended. 2) What is the Solar Backpack made of? A heavy duty nylon 600D + jacquard stiching. 3) Does the Solar Backpack only operate with sun exposure or can it be played at night? Operable day & night for a limited amout of time. 4) Does the Solar Backpack come with rechargeable batteries? Batteries are not included. (rechargable batteries required) 5) How much does the Solar Backpack weigh? (Measured in pounds) 2 lbs. 6) What is the shipping time of the solar bag into ? Shipping is via DHL & has an estamated delivery time of 5 to 8 days. 7) What phones will the adapters work on? Motorola, Ericsson, Nokia, Samsung & Siemens, iPhone.