The Insta360 Fast Charge Hub is a triple bay charger designed specifically for Insta360 ACE/ACE PRO Batteries. This charger can charge (1) one, two (2) or three (3) batteries simultaneously (x2 faster charge than charging through the camera). With an integrated smart charging circuit, this charger automatically optimizing the charging sequence when more than one battery is connected. The indicator lights on the Fast Charge Hub will flash red/green once the hub is connected to USB Type-C charging cable and plugged into a compatible wall adapter (USB wall adapter sold separate - 2A rated adapter required).When the battery is inserted into the slot the charger will then analyze the battery and illuminate red during the charging sequence. Once the charge is complete the indicator light will illuminate green. Fast Charge Hub SpecificationInputUSB-C Smart Charging 12V/3A Charging portUSB Type-CWorking Temperature-4F to 104F (-20C to 40 C)Charing Temperature32F to 104FCompatible DevicesCharges up to x3 Insta360 ACE/ACE PRO BatteriesBattery Base SpecificationsRated Voltage: 3.85VMax Charge: 4.4VRated Power: 1650mAh / 5.46Wh