Features: Brand new and high quality I2C bus communication, monitoring the batteries voltage, current, power, and remaining capacity in real-time. 0.91" OLED for displaying info like batteries voltage, IP address, RAM- usage, etc. 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 2.5A continuous output current. Batteries warning indicators, easy to check if the battery is connected correctly. Specifications: Output voltage: 5V Charger:8.4V 2A Control bus: I2C Dimensions: 113 × 79mm Battery support: 18650 li battery (not included) Mounting hole size: 2.5mm Type: EU, US(optional)) Package Includes: 1 x UPS Power Module 1 x 8.4V battery charger 1 x 6PIN 9cm cable 1 x Screws pack 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!