Solar-Powered 10,000 mAh External Battery USB Charger (Waterproof)
Compatible with any USB device, such as smartphones. 10,000 mAh will charge most phones 3-4 times. 2 output ports allow you to charge 2 devices at once.
Strap it to your backpack while you day-hike, then charge up at night. An LED indicator lets you know how much power is available.
Size: 139 x 75 x 20 mm