Features Key Features Powerful <5mW Class IIIa 635nm red FDA approved laser diode Easy push ON/OFF button Durable plastic case which will last a lifetime Easy install, just attach to shaft, align and you’re ready to go Individually packaged in white gift boxes Small measurements of 1″ High x 2-5/8″ Wide x 3/4″ Deep Includes (1) fresh CR2 Lithium battery ready for use BUY WITH CONFIDENCE!