Features 7 WAVELENGTHS: Intelligent memory, short press the input key, and cycle through seven testing wavelengths to meet various testing needs. Automatically save the last test wavelength when shutting down. ABS SHELL: ABS material for the meter shell has a delicate feel, is wear resistant and scratch resistant, and can be used for a long time. SENSITIVE AND ACCURATE: With sensitive chip and sturdy internal structure, the measurement is fast and accurate, without waiting for preheating, use immediately. MULTI FUNCTIONAL: Optical power meter and VFL, with good testing accuracy and fine workmanship, stable and reliable to use. EASY CARRYING: Fashionable and lightweight, with exquisite texture, compact size, and convenient carrying. Specification: Item Type: Optical Fiber Power Meter Material: ABS Battery: Lithium battery x 1 (400mah) (shipped with built in battery) Wavelength Range: 800 to 1700 Detector Type: For InGaAs Measurement Range: -70 to +6 Uncertainty: ± 5% Standard Wavelengths (nm): 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625 Display Resolution: Linear Display: 0.1% Logarithmic Display: 0.01dBm Frequency Identification (Hz): 270, 1000, 2000 Static Current: Less than or equal to 18uA Working Current: Less than or equal to 25mA Battery Life: Greater than or equal to 20H Charging Voltage (v): 5 Charging Current: Less than or equal to 500mA Charging Duration: Less than or equal to 3H Automatic Shutdown Time (min): 10 Package List: 1 x Optical Fiber Power Meter 1 x Charging Cable  1 x Lanyard  Package List 1 x Optical Fiber Power Meter 1 x Charging Cable 1 x Lanyard