20000mah solar power bank waterproof shockproof with compass portable solar powerbank external battery for cell phone emergency used

feature: 1:mobile power storage, portable for both in door and outside excellent quality ensured 2:perfect power supply for business trip, travel, field worketc: 3:fit for all kinds of mobile digital devices, with a micro usb port. 4:repeatedly use of a single charge, portable design, convenient to carry