1. 2in1 Battery ConverterThis battery converter was designed to provide versatility and comfort for your power tools. It features a USB interface, allowing you to power your tools and charge your phone simultaneously. 2. OnetoTwo Battery ConverterWith this converter, you can install two batteries at the same time, providing strong battery life for your tools. It maximizes usage time and ensures uninterrupted work over longer periods. 3. External Charger CompatibilityThe converter can be connected to an external charger, allowing you to charge the batteries without removing them from the converter. This saves time and effort, ensuring your tools are always ready for use. 4. Secure locking mechanism: The converter locks firmly onto your batteries, providing a stable and secure connection. Your batteries will stay in place during operation, delivering a reliable power source for your tools.