Suction cups to any window and recharges your mobile phone using the available sunlight, these promotional solar window rechargers are available in a range of colours and make sure you're always available. Feature: 1. With LED indicator, it's red under charging status and turns off when fully charged 2. It adopts intelligent chip, support overcharge/discharge/overload and short circuit protection 3. Put it on the glass windows which must be clean without dust,a bit wetness can strengthen the cohesive force.Technical Attributes Include: 2000 mAh ,3000mAh,5000mAh Extras: Mini USB cable