Two different product experiences with standard included extension tube High efficiency constact current circuit. Constant brightness Intelligent memory function Anti-roll, slip-resistant body design U-shaped tail cap facilitates operation with gloves and also prevents accidental activation Specifications Led model : cree xm-l2 Battery options: 1*aa/2*aa battery with extension tube on Size : length 103mm * diameter 21mm* head 26mm Weight:62 g (80g including extension tube , excluding battery ) 103mm*21mm*26mm 62g(80g including extension tube, excluding battery)