Standard header, supports series boards Incorporates Li-po battery switching charger with path management, more stable power supply I2C bus communication, monitoring the battery voltage, current, power, and remaining capacity in real time Multi battery protection circuits: over charge/discharge protection, over current protection, short circuit protection, and reverse protection, more safe and stable.Onboard recharging indicator, power indicator, easy to check the battery status Features At A Glance The -UPS-B is a dedicated UPS (Uninterruptible Power Supply) module designed for . It incorporates Li-po battery switching charger with power path management, and voltage/current monitoring chip, allows monitoring the battery operating status via I2C bus. What's more, the male pin header possible to "stack" other modules on top. Uninterruptible Power Supply For Keeps Your Running While Recharging, Monitoring Battery Via I2C, Stackable Design Header Compatibility Onboard Female Pin Header For Direct Attaching To ,Male Pin Header For Stacking Other Modules RECHARGE VOLTAGE:5V CONTROL BUS:I2C BATTERY SUPPORT:600mAh 3.7V Li-po battery DIMENSION:62 x 21mm Note and Li-ion battery are NOT included. Colour:blue Material:PCB Package Contents: 2 x -UPS-B Board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.