General Description:The most difficult thing for software developer is that they know little about hardware design, in case of clients requirements can not decide on PC software to work out, then some external devices is very necessary for them. Such as: Record incoming calls, outgoing calls, controlling line status, detecting phone status and justifying ring times, etc. Therefore, those functions are very useful for software developer so that they can speed research progress.AD409 provides detailed functions for hardware via USB transmission. To reduce development time for PC software, AD409 also provides all-round Software Development Kit(API :VC++) in order to make you accomplish your required program within your wanted. AD409 can let you understand operated status between PC software and hardware via its correlative DEMO program. With AD409 will give you more convenient and enjoyment.Applications:- Special line for Insurance field Phone Management- Phone Purchasing Management- Bank Phone Management- Finance Department of Bank Phone Management- Credit Card Service Centre Phone Management- Contacts of Real estate Agency Phone Management- Policeman, Police Station, Prison Phone Management- Service Centre Phone Management- Aviation, Telecom, Management Centre- Monitoring Service- Company Management- SOHO family Phone Management- Family Monitoring SolutionFeatures:. Incoming calls records. Outgoing calls records. Line using status indication. Phone using status indication. Talking time record from starting to stopping point. Provide polarity reversal signal and reversal detecting. Provide incoming ring signal detecting. Line status controlling. LED indication controlling