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Check the listing for details. DC-DC 3.6-20V to 150-500V Constant Current Boost Step-up Power Regulation Module. Condition: New. Listed at 4.64 USD. Relay Module. The module generates heat during operation; do not touch it with your hands. Constant-current design with adjustable output current from 0.1 to 20 mA. We are professional industrial&electronic Categorie manufacturers in China.