The recessed LED lights indicate the power stored in the unit (6 green lights show the unit is fully charged) and when unit needs to be recharged the last LED will turn red. Recharge the powermonkey discovery via your computer's USB port. Control of the powermonkey discovery is done via the metal on/off button located at the top of the unit, whilst the USB port has built-in self-sensing technology which allows the unit to optimise the charging parameters for the iPhone and other smartphones. Kit Includes: 1 x powermonkey discovery, 1 x USB connection cable, 5 x adaptor tips including Mini & Micro USB, 1 x travel pouch. Dimensions: 114x13x46mm. Weight: 107g.