PulsePak Battery Booster of up to 2 Hours for Micro-USB Smartphones - Retail Packaging - Black BATTERY BOOSTER: Never be stuck with a dead battery again! Up to 2 hours of extra battery life that will hold a charge for up to 3 months. Ideal for Micro-USB Smartphone's (Android, Windows, Blackberry etc.) CONVENIENT: PulsePak is the only rechargeable battery pack small enough to fit on your keychain. Features a quick release clasp so it is ready at a moments notice to provide an extra power boost. RECHARGEABLE: Lithium polymer battery. PulsePak battery booster will hold a charge for up to 3 months and is rechargeable to provide constant use when power boost is needed. SMALL: The only rechargeable battery pack small enough to fit on your keychain. Size allows you to have up to a 2 hour battery boost with you at all times. INCLUDES: 1 Rechargeable Lithium Polymer Battery with Retractable Micro-USB plug and Micro-USB cable.