SpinPOWER I4 iPhone 4 Bicycle USB Charger KIT Enjoy unlimited iPhone 4 use while cycling  Apps, MP3, GPS, Make/Receive Calls Provides high-efficiency charger output required for power-intensive GPS, cycling, and fitness apps Compatible with iPhone 4 models. Easy to attach, simple to use. Fits most bicycle frames. Charges other USB-chargeable devices such as bike lights, cameras, GPS units, iPods, and MP3 players Includes iPhone 4 bicycle mount, dynamo power generator, USB charger, and all mounting brackets