Indy Impinj R2000 chip uhf rfid fixed reader 4 ports long range 1-30m rfid reader 860-960mhz with free C++ C# Java SDK

1,TOP1-Quality 4ports impinj r2000 uhf rfid reader in china 
2,Long read range 1-35m which can adjust the read range ,and can read multi-tags 1-500tags/second(depend on antenna/tag/application)
3, With wide frequency 840-960mhz , 902-928mhz(US frequency) and 865-868mhz (EU frequency)
4,Mutil-connector:Ethernet TCP/IP(RJ45) , rs232 TTL uart(serial port) ,RS-485 interface
5,Excellent &Stable performance ,provide free sdk and free test tag sample