The Skullerz 8883 Rechargeable Hard Hat Accessory Power Bank is designed to power a variety of devices, including the Skullerz 8884 Hard Hat Fan and 8886 Wide Beam Headlamp, small USB-C devices, phones and more. This battery pack easily installs onto Ergodyne hard hats and safety helmets using their built-in accessory mounts, eliminating the need for straps. With a powerful 3350mAh capacity battery, it delivers up to 10W of total power, providing reliable energy for your essential tools and gadgets. Battery includes two USB-C ports for both input and output, enabling you to charge or power two USB devices simultaneously. For added convenience, the battery includes a USB-C to USB-A cable, ensuring compatibility with a wide range of devices. Magnetic back securely attaches to metal surfaces for hands-free access and convenient storage. Built-in smart protection ensures safe and efficient operation by avoiding overcharging, short circuits or extreme temperatures. Four LED indicators make it easy to monitor the remaining charge, keeping you informed throughout the day. This battery power bank has a drop-test rating of 6.6' and is IP54 rated for dust-resistance and water-resistance.