The HTC One (M9) External Battery Case Features: • Sleek, stylish and slim-fit design • The powerful 3200mAh built-in battery effectively extends the battery life of your HTC One (M9) • Durable, yet lightweight, hard-shell provides protection against bumps and drops • Power up with the touch of a single button • Easy access to all functions, controls, speakers and cameras Specification: -Material: Plastic -4 Led indicators for power balance -Dimension: 157(L)*73(W)15(H)MM -Capacity: 3200mah -Charging time: around 3-5 hours -Input voltage: 5V -Input Current: 0.5A -Output Voltage: 8V -Output current: 0.8APackage Includes-1 x Battery Case  1 x Screen Protector