Specification: Brand Sofirn Diameter 47. 50. 1 Suit for 3.5 x 3.5mm Mode operation: Off, one click goes to 1st mode, while one presshold (~ 1/3 sec) goes to last mode If UP, a click goes to next mode, while a presshold goes to the previous mode If interrupting in one mode (over 1.2 seconds), the mode locks in & then one click will turn off the light If you are locked in one mode, a presshold will still work to go to previous mode, & the lock-in cancels In any mode, including OFF, hold for a long time (over 1.2 seconds), the 1st Strobe will be ON To engage battery check, OFF, do a click quickly followed by a presshold To lock-out the light, followed by OFF, 2 clicks in fast sequence quickly through a presshold. same unlock. When in strobe, clicks without a break becomes the next special mode (strobe or beacon). the special modes work just like normal modes: presshold goes to the previous special mode, it will interrupt in a mode. In battery check mode, one click will flash out temperature in Celsius (not factory calibrated), another double-click will flash the firmware version (v 1.0 is 1 blink followed by a break). Package included:1 x LED driver