Diameter: 20mm

Thickness: 1.5mm

The height of spring: 10mm

Modes: 4 Groups

1. 2 mode, Low 10% - Hight 100%

2. 3 mode, Low 5% - Mid 30% - High 100%

3. 3 mode, Low 5% - Hight 100% - Fast strobe ( or low strobe 2hz, flash twice per second)

4. 5 mode, Low 5% - Mid 30% - Hight 100% - Fast strobe - SOS

Default mode: 5-mode Low 5% - Mid 30% - Hight 100% - Fast strobe - SOS

With mode memory function

With low voltage protection function: automatically lower the brightness and flash once per second when the voltage lower than 2.9 ~ 3V.