7 optical wavelengths for selection: 850nm, 980nm, 1300nm, 1310nm, 1490nm, 1550nm and 1625nm. Suitable for universal 2.5mm adapter.LED Lighting Function: Able to play a role as a flashlight to check lines and build in the dark. No operation within 10 minutes, energy saving.900mAh rechargeable lithium battery: Large capacity lithium battery, USB charging mode, power supply more durable and more convenient.Additional features: Length data memory wave, frequency identification, self-calibration, overload protection, overcurrent protection, overvoltage protection, overvoltage protection, short circuit protection and temperature protection. Wide application: Applied in optical fiber engineering, optical fiber sensor research, optical element production, optical element research, etc.Specifications:Material: ABS Power supply: 3.7 V 900 mAh lithium battery Interface type: Suitable for universal 2.5mm adapterCharging time: 3 hoursDuration: 18 hours Detection area: 300 mPower measurement range: -70~+3dBmLogarithmic display resolution: 0.01 dBmLinear display resolution: 0.1%Wavelength range: 800 ~ 1700 nm Accuracy: 5% (nm)Wavelength reference: 850nm, 980nm, 1300nm, 1310nm, 1490nm, 1550nm, 1625nmOperating temperature: -20~60Storage temperature: -25~70Auto shutdown: no operation within 10 minutesItem size: approx. 127*45*20mm / 5*1.77*0.79in Item Weight: Approx. 87 g / 3.07 oz Package Size: Approx. 150*62*40mm / 5.91*2.44*1.57inPackage weight: approx. 110g / 3.88ozNote: Please read the user manual before use.Packing List:1 * Optical Power Meter1 * USB Charging Cable1 * User Manual(English) Note: The data are all referential Manual measurements, please allow 1-3cm error, due to the difference in light and display, there will be a certain color difference, depending on the physical object received.