Features:   1. Compact and portable: being so mini and light-weight, this product does not take much space and can be easily taken away.   2. Durable material: This product is made of high-quality material, durable, long service time, firm and stable in use.   3. Cable test: Accurately test whether a single network cable transmitting signal normally.   4. Entity button, sound feedback, concave convex design, touch feedback. Humanized design to improve work efficiency.   5. LED Night Lighting: LED flashlight lighting function is convenient for line checking construction in dark environment.         Description:   High performance and great reliability, durable replacement for the old or damaged one, no longer need to worry about not finding the right accessories.         Specifications:   Measuring range: -70+3   Size: 131*40*19mm   Working temperature: -10 to +60℃   Storage temperature: -25 to +70℃   Power supply: built in 900mah lithium battery (rechargeable)   Automatic shutdown time: 10min   Battery continuous working time: ≥ 120h   Color: black      Package Included:   1 * Optical Power Meter   Notes:1. Please allow 0-1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from real object.