1. XHP70 6V 2-cell lithium battery constant current drive board gears: built-in 2 sets of 8 gears (5th Gear + 3rd Gear) 2. Group 1 five gears: low-medium-high-flash-SOS (5%-40%-100%-flash-SOS) 3. Group 2 three levels: low-medium-high (5%-40%-100%) 4.5 levels of memory dimming: light up the 2-second memory level. 5A current with low voltage prompt function and reverse polarity protection function. Diameter 22MM, output voltage 6V, input voltage 6-12.6V wide voltage (driven by 2-3 cells lithium battery) 5. How to change groups: Wait for about 5 seconds for any group with low brightness. When you see the flashlight flashing automatically, turn off the flashlight immediately, then turn it on again to change groups. Different Batches May Have Differences In Product Appearance, Color, And Printed Characters, Which Will Not Affect The Use Function: 5A current, built-in 2 sets of 8 levels (5 levels + 3 levels), default 5 levels, 2 seconds memory dimming; constant current drive; low voltage prompt; anti-reverse connection protection Input voltage: 6V-12V Circuit board diameter: about 22MM Colour:As Shown Material:Plastic Package Contents: 3x Constant Current Driver Board Module