Features This mobile power charging board supports for iOS interface and for Andriod Type‑C Micro USB. With LED indicator display, charging board can clearly and intuitively present the current battery level . This charging board has multiple protection, including prevent overcharge protection, prevent over discharge protection and short circuit protection. With small and portable, this module is a portable backup power source, and its input is matched with a 5.0V adapter, which can charge the internal battery. Contains four charging boards, this set can allow users to use enough without worrying. Specification: Item Type: Mobile Power Charging Board Material: Resin Quantity: 4 IR of PCM: ≤65mΩ Allow 0V Change: Yes Constant Current: 2.4A Dual Output Current: 5V 2.4A Input Voltage B + to B-: DC3.0-4.2V Protection Against Overcharge: Detection Voltage: 4.20±0.05V Release voltage: 4.100±0.05V Detection Delay Time: <200 milliseconds Protection Against Over-Discharge Detection Voltage: 3.0±0.10V Release Voltage: 3.10±0.10V Detection Delay Time: <100 milliseconds Short Circuit Protection Short Detection Delay Time: <50μS Release Condition: Cut off the load Normal Current Consumption The Normal Current Consumption of PCM: 60μA maximum Stanby Current Consumption: 50μA maximum Recommended Working Conditions Maximum Continuous Charge/Discharge Current: 1.5 / 2.4A Suggested Working Temperature: -5~45℃ Package List: 4 x Mobile Power Charging Board Package List 4 x Mobile Power Charging Board