3PCS PC817 4 Channel Optocoupler Isolation Board Voltage Converter 3.6-30V Driver Photoelectric Isolated Module workwarehouse Easy to Use & Compression

Easy to Use & Compression Therapy - Secured with a comfortable elastic strap

The back mesh pad allows it breathable and keeps your waist dry and fresh while exercise

100 Strips/Vial for Use With Steramine & Other Quaternary Sanitizers

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5 Volt Single Ended Flange Base 20 Hours Rated Average Life TL-1

3PCS PC817 4 Channel Optocoupler Isolation Board Voltage Converter 3.6-30V Driver Photoelectric Isolated Module workwarehouse Easy to Use & Compression3PCS PC817 4 Channel Optocoupler Isolation Board Voltage Converter 3. 6 30V Driver Photoelectric Isolated Module Driving port signal voltage: 3. 6 24V Output port voltage port: 3. 6 30V Jumper cap can achieve output port is high potential or pull down output Onboard 4 channel 817 are independent: can achieve different voltage control at then same time This module is used when it is necessary to isolate the control in actual work and voltage