Features Better Testing: Designed to have a wide testing range of ‑70~+10dbm, the optical fiber power meter enables higher accuracy. Reliable Using: Also has relative power calculation and calibration function, making the measurement much more convenient. The Wavelength: 850nm, 980nm, 1270nm, 1300nm, 1310nm, 1490nm, 1550nm, 1577nm, 1625nm, 1650nm, 10 kinds wavelength for work. Simple Working: Comes with sensitive chip and sturdy internal structure, just plug and play, also ensures quick response. Easy Carrying: Light in weight and compact in size as well, the easy carrying allows for both indoor and outdoor using. Specification: Item Type: Optical Fiber Power Meter Model: AUA-DC7 Material: ABS Probe Type: InGaAs Wavelength Range: 850-1650nm Standard Wavelength (nm): 850, 980, 1270, 1300, 1310, 1490, 1550, 1577, 1625, 1650. Automatic Shutdown Time: 10 Minutes Power Measurement Range: - 70~+10dBm Power Supply: 3.7v 650mah polymer battery, shipped with built in battery.  Package List: 1 x Optical Fiber Power Meter 1 x Lanyard 1 x USB Cable 1 x User Manual Package List 1 x Optical Fiber Power Meter 1 x Lanyard 1 x USB Cable 1 x User Manual