... ,1550nm,1625nm. And works at a variety of modulation frequency (CW, 270HZ, 1KHZ, 2KHZ). It is widely used in optical fiber ... Stability(dB)±0.04@20°C@15minModulation FrequenciesCW,2Hz@650nm;CW,270Hz,1KHz,2KHz@OthersFiber TypeSM,MMPower Supply1pcs 9V Batteryworking time ...