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RS232 to RS485 RS422 interface converter
DT-9028 is an industrial-grade optical isolation multifunctional converter with external power supply, it compatible with RS-232/RS-485/RS-422 standard.
fiber modem
DT-9077 fiber modem implements advanced optic transmission technology to extend signal transmission distance up to 120km on single-core fiber
USB to Fast Ethernet Controller
DT-5016 USB2.0 Male to RJ45 Female Ethernet Network LAN Cable Adapter 10/1000Mbps for Apple Mac Book, Lenovo, ThinkPad, Dell, Sony, Samsung, Acer, Asus etc brand laptop, Tablet PC which without RJ45 interface
USB to DB9 and DB25 Adapter
DT-5018 USB to Serial (DB9) and DB25 Cable is your fast solution to utilize the peripheral with serial port and DB25 port  in an easy-to-use environment such as plug-n-play and hot swap function.
USB to 5M Extension cable
DT-5017 USB extension cable allows you to connect your USB device to your computer at a distance of up to 5meters. 
USB TO RS485/422 cable
DT-5019 is a kind of USB to RS-485/422 industrial intelligent converter and no power need.
Top-selling DTECH DT-6625C 25M hdmi cable with chip
DT-6625C Full HD 1080P HDMI Cable 25m male to male HDMI 1.4v built-in IC-Signal amplifier chip is a high quality hdmi cable, transmit hdmi signal, supports full HD 1920*1080p video format.
hdmi cable 30m
DT-6630C Full HD 1080P HDMI Cable 30m male to male HDMI 1.4v built-in IC-Signal amplifier chip is a high quality hdmi cable, transmit hdmi signal, supports full HD 1920*1080p video format.