Feature: 1. Multi-specification Optional: This adapter is designed for recharging lithium batteries, with three optional voltages of 16.8V, 18V, and 21V, compatible with a variety of lithium-powered tools with different voltage requirements, enhancing versatility to meet the needs of various devices. 2. Efficient Charging: Utilizes advanced charging technology to recharge lithium batteries quickly, reduce charging time, improve work efficiency, and help extend battery lifespan. 3. Multiple Protections: Built-in safety mechanisms including overcharge, overheating, and short-circuit protection to enhance charging safety and reduce the risk of battery damage or safety issues. 4. Fine Craftsmanship: Constructed with high-quality materials and a precise manufacturing process to ensure durability, reliability, and stable performance in various environments. 5. Portable Design: Compact and lightweight for easy portability, suitable for multiple applications. Equipped with an LED indicator to provide real-time charging status for a more intuitive user experience. Specifications: Name: Battery Power Adapter Material: Plastic + Metal Output Voltage: 16.8V, 18V, 21V (selectable) Input Voltage: 100–240V AC Current: 1A Item Size: 87 x 50 x 68mm / 3.43 x 1.97 x 2.68in Item Weight: 69g / 2.43oz Package Size: 100 x 80 x 60mm / 3.94 x 3.15 x 2.36in Package Weight: 73g / 2.57oz Packing List: 1 x Battery Power Adapter