Have a smartphone? Then you probably need an external charger. The Joosa Power Charger is one of many that are vying for you attention, and your hard earned cash. This particular device will allow you to charge your phone up to four times before you need to charge the pack itself. And it will power it up just as quickly as a mains charger, so you won't have to hang around. The Joosa charges everything from phones and music players to Bluetooth speakers and e-readers. To figure out how much power you have left simply shake it and the LEDs light up.

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