Very small in size and easy to carry intelligent power saving shutdown LED lighting is supported pressing clamshell, fashion trend.support USB charging, charging treasure, COMPUTER USB port. 600mAH built-in battery. Output wavelength: 650nm. Interface type: 2.5mm universal adapter Working temperature: -20-and60 Storage temperature: -40-and85 Output power: 10mW operate time:Greater than10h weight:38g Usage :Open the battery slot and put the prepared battery into the battery tank (pay attention to the positive and negative poles of the battery),According to the dust cover is opened,the measured 2.5mm interface optical fiber connector into the device. Hold the 650 button to start measuring.According to a red light,then a flash,then turn off the light cycle.650 red light is forced to close by 3 seconds.When the dark environment is used,the lighting function can be realized according to LED:Turn on the lighting once and then turn off the lighting cycle.Turn off the red light regularly and turn off at 3 seconds. Maintenance and matters needing attention:The laser-light is harmful,especially need to pay attention to the protection of the eyes,Laser-work is strictly prohibited to look straight at the red light.In general,the higher the temperature,the shorter the life,as far as possible to avoid the use of high temperature environment.After a period of time,please use special optical fiber to clean the swab cleaning interface. Colour:black Material:plastic Size:125 x 35 x 17mm Package Contents: 1 x Fiber Optic Tester Pen 1 x USB Cable 1 x Ceramic core 1 x Lanyard Only the above package content, other products are not included. Note: Light 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.