Description There is always plenty to talk about during fiber-optic cable installation and maintenance,Website:http://www.greentelfttx.com,however not everywhere we can talk to each other especially installing cables in the areas with no existing signal coverage. Now the AOT600 Optical Talk Set lets you do just that,it is designed to allow voice communication over fiber optic cables.It can also be used as a light source to facilitate testing and fiber identification. Features ● Talk by connecting with fiber● Light source capabilities● Full-duplex communication with high quality● Long and short mode for different distance● Wide dynamic range: 45dB;Large dynamic distance: >120km● Keep pressing "call" can remind each other● Power autonomy of 70 hours● One-year warranty and Three-year recommended calibration intervalSpecification Optical Talk Set - AOT600 Parameter ModelAOT600WavelengthA: 1310nm, B: 1550nmOperating StyleFull duplex communicationOutput Power> -5dBmFiber TypeSMDynamic Distance*SM fiber: > 120 kmDynamic Range*SM fiber: 45dBConnecting AdapterFC / PCBattery ChargeOptionalOperate TimeAbove 12 hoursPower Supply2 * AA batteries or AC/DC adapterSize(H*W*D)190mm *75mm * 40mmWeightAbout 200gStorage Temperature-20  to  +60℃ ,<90% RHOperating Temperature-10  to  +50℃ ,<90% RH* Without using the fiber clamp for connectingStandard Package①AOT600 main body*1②Nylon bag and the Q/C certificate*1③Operation Manual*1 ④Paper Box