USB, Digital Output Board, 7 Channels, Current Sink Output, Bus-powered

Optocoupler Isolation Board 8 Channel Driver Photoelectric Isolated Module

Hilitand DTMF Relay Board 16 Channels Audio Decoder Card DTMF MT8870 Audio Decod

Keithley KUSB-3160 (96 channels of Digital I/O, all on USB interface)

Waveshare Industrial Isolated Multi-Bus Converter USB / RS232 / RS485 / TTL

Waveshare AS7341 Spectral Color Sensor Visible Spectrum Sensor Multi Channels

USB 2.0 Digital Isolators 480Mbps USB High-speed Isolated for Current Sound

PNP Output 8 Channels Photoelectric Isolation Module Level Voltage Conversion