A great solution for smartphone users going on long distance rides. High quality silicone holder tightly grips any smartphone (4.5 - 5.5 screen) with or without a case. The high power 7800mAh dual USB port power pack can charge two devices simultaneously. On a ride, you can charge your smartphone, sport camera or front light. When you′re off your bike, it becomes a portable power bank to charge your smartphone or tablet, either separately or together. Silicon and engineering grade plastic constructionMounts to stem, handlebar, or 22.2-40mm tubes13x6.9x5.7cm275gBattery: 7800 mAh Li-Ion with auto-off for maximum run timeInput: Micro USB - DC 5V 1A (Max)Output: Dual USB ports - DC 5V 2ABattery Level: 4 LED indicatorCharge Time: 12hrs AppxCertificate: CE / FCC / RoHS / BSIM