FEATURES: Charge your Pods with a lightweight base that delivers easy and smart stack charging Stack charge up to 6 Pods at the same time, with a charge that lasts for eight hours The base also has a built-in safety mechanism against overcharging Lightweight, easy to use, and comes with a USB cable You can always be ready for the next exercise. Recommended for simultaneous work with over 6 Pods and large groups & facilities Includes 1-Charging base