Features: Brand new and high quality Adapting various interfaces via cables, easy to integrate into mobile robots or industrial control equipment. I2C bus communication, monitoring the batteries voltage, current, power in real-time. Multi battery protection circuits: over charge/discharge protection, over current protection, short circuit protection, and reverse protection, along with the equalizing charge feature, more safe and stable. Onboard 5V regulator, up to 5A continuous output current, more sufficient power source for Raspberry Pi and Jetson Nano. Batteries warning indicators, easy to check if the battery is connected correctly. Comes with online development resources and manual. Specifications: Output Voltage : Batteries series voltage; 5V 5A; 3.3V 300mA Control Interface: I2C Battery Support: 3 x 18650 Li batteries (in series, NOT included) Charger: 12.6V 2A Dimensions: 60 93mm Mounting Hole Size : 3.0mm Style: EU,US (optional) Note: Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 x Uninterruptible Power Supply