Output power: 10mW;output wavelength:650nm;working temperature:-20 ~ +60 Celsius;Storage temperature:-40 ~ +85 Celsius;Battery Type:AAA battery *2 or lithium batteryapolegamy;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 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 of the laser,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*35*17mm Package Contents: 1 * Fiber Optic Cable Tester 1 * USB Cable 1 * Ceramic core 1 * 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.