4.2V-4.5V Dual Output: Precisely adjust voltage for battery activation and maintenance, compatible with lithium-ion batteries. 400+ Model Compatibility: Supports mainstream for and for Android devices (400+ models), with labeled slots for quick connection. One-Click Activation: Instantly switch to fast-charging mode with the dedicated button; blue LED indicates active status. Auto Power-Off: Automatically shuts off when charging completes; red LED alerts for over-voltage/over-current. Voltage Range: 4.2V-4.5V (adjustable via dial) Color: As Shown Material: plastic Package Contents: 1 x MAX20 Battery Chip Active Panel 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.