General description You can check the battery level and charge up to 3 batteries in order from high to low power. The 3-Way Charging Hub for Mini 3 Pro Battery Butler PRO Charger also allows the MINI 3 battery to function as a power bank for charging the remote control or other USB devices. Additionally, it provides convenient storage for batteries, making it easy to transport. Technical specifications Input: 5V/9V/12V--3A (max) Output: 8.5V==4.0A (max) USB output: 5V/2A Charging time: 2453mAh battery about 90 minutes (45 minutes per battery); 3850mAh battery about 130 minutes (65 minutes per battery) Color: As shown Material: Plastic Measurement allowed error: +/- 1-3cm Compatibility and accessories Package Contents: 1 x 3-Way Butler 1 x USB-A to USB-C Charging Cable 1 x USB-C to USB-C Charging Cable