HMT-1 only. The Multi-Charger simultaneously charges 6 HMT-1 batteries. Multi-chargers are needed to keep extra batteries charged. They ensure fully charged batteries are available at the start of each shift. They are also necessary if it is not possible or practical to plug multiple HMT-1s into multiple USB cables and power outlets. Multi-chargers conveniently display the charge level of each battery on a high visibility backlit display, so battery levels can be determined at a glance. Each Multi-Charger ships with all 5 regional power adapters. Shown with batteries, not included.