Fits on your rail. Use a rechargable battery, I do.
Brand Name: WOLTIS
Origin: CN(Origin)
Model Number: G17 G18C G19 G22 G24
Weight: 50g
Material: Plastic and Metal
Color: Black
Body Length: 77mm
Reticle Color: 20mm rail
Battery Type: 1 x CR123A 3V (not included)
Output: 150 Lumens