Features: Small size, lightweight and portable, comfortable to hold. Universal port, supports SC, for FC, ST three common optical fiber interfaces. High-tech chip, good stability, accurate test, high-sensitivity detector, accepting the light source to measure the value in seconds. Built-in USB rechargeable battery, long battery life, design with LED light, convenient for line inspection and construction in dark environment. Seven wavelengths and for smart memory: Short press the for key to switch between 7 test wavelengths to meet various test requirements. The last test wavelength is automatically saved when shutting down. Specifications: Material: ABS Size: Approx. 34x17x125 mm/1.34x0.67x4.92 in Wavelength range: 800~1700 Probe type: InGaas Uncertainty: 5% Display resolution: linear display: 0.1%, logarithmic display: 0.01dBm Frequency identification: 0Hz, 270Hz, 1000Hz, 2000Hz Standard wavelength: 850/980/1300/1310/1490/1550/1625nm Quiescent current: 18uA Life time: 20H Charging current: 500mA Automatic shutdown time: 10 minutes Battery capacity: 400mAh Working current: 25mA Charging voltage: 5V Charging time: 3H Power supply: built-in lithium battery, USB port Note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Optical Power Meter (Built-in Lithium Battery) 1x USB Cable 1x Lanyard 1x Instruction Manual