Features: Easy: Flip open the cap and plug straight into any USB port. No charger, no fuss. Charge from anything: No cords needed - go right into a laptop, wall block, power bank, or car USB. If it has a USB port, it charges these. Know when they're ready: A red light means charging, blue means good to go. No guessing. 500+ charges per battery: Stop buying disposables by the pack. One set replaces hundreds of single-use batteries and pays for itself many times over. When the power's out and you need a flashlight, a radio, or a headlamp to actually work, dead single-use batteries are the last thing you want to find. EasyPower USB Rechargeable Batteries recharge from any USB port, hold up for 500+ cycles, and are ready every time you reach for them. Grab a few packs and stop feeding the disposable-battery habit for good.