Features: The 18650 Battery Tester features innovative energy recycling technology that converts discharged power from channels 1 2 into charging energy for channels 3 4, optimizing energy efficiency while reducing waste for users. This 4 channel chargers utilizes advanced battery management to monitor charging/discharge cycles, crafted from ABS plastic with European standard safety certifications for battery maintenance. Ideal for electronics enthusiasts, repair technicians, and users requiring precise battery capacity testing and efficient multi cell charging solution. Perfect for home workshops, electronics repair stations, and laboratory environments where simultaneous charging/discharging of multiple 18650 batteries demands space saving, energy efficient equipment. Its compact design integrates intelligent power redistribution technology, ensuring minimal energy loss during operate while maintaining stable output across all channels. Specifications: Component: Plastic Capacity: 0000-9000Ah Power: 0000-9000Wh Resistance: 0000-9999mΩ Size: About. 18.8x3x13cm/7.4x1.18x5.12in Pattern: With Bluetooth-compatible/Without Bluetooth-compatible Package Includes: 1 Set Charging Station note: Please allow 1-2cm errors due to manual measurement. Due to difference between different monitors, the picture may not reflect the item actual color.