Ready to eliminate alkaline waste once and for all? This kit is a giant leap forward, packed full of all the USB-C rechargeable batteries you need. Fast Charging Lithium Battery 1000+ Charge Cycles Convenient USB-C Charge Port Just plug any USB-C cable or use the included cable to charge four batteries at once. Built-In LED Charging Indicator Paleblue Batteries let you know when they are fully charged. On-Board Smart Technology Provides Safe Charging No more batteries ruining expensive electronic devices!