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.<br><br>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<br><br>Package Contents: 1x Constant Current Driver Board Module<br><br>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.