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Digital to Analog Audio Decoder
DT-6520 is easy to connect many entertainment devices which with optical and coaxial digital signal and analog output signals
Hot-swappable VGA Matrix
DT-7026 supports 2 input 2 output, can connect to 2 HDMI sources and switch among them to 2 displays. With remote controller
USB to RS232 adapter
DT-5001A is 2.0 standard, full-speed, high speed, backward compatible. 
Passive industrial converter
DT-9000 is compatible with RS-232C,RS422, RS-485 standard.
High Resolution HDMI Splitter
DT-7144 HDMI Splitter is the perfect solution for 1 HDMI device to 4 HDMI devices with 4K.
VGA Audio Splitter
DT-AU7508 VGA splitter is the perfect solution for anyone who needs to send one video signal to 2 displays at the same time, with audio input and output.
Active USB extension cable
DT-5026A is  ordinary USB device without power supply can be used directly.
HDMI Switch 3 to 1
DTECH DT-7018 3 in 1 out HDMI SWITCH support 1080p and 3D