One DC 12V/24V electronic stepless speed regulator switch for precise motor control. Key benefits and features Easy wiring and precise control Red wire connects to power and motor positive Blue wire connects to motor negative Black wire connects to power negative Designed for straightforward installation with compatible DC motors used in fans, heaters, and defrosters Stepless speed adjustment for reliable performance Supports 12V up to 120W and 24V up to 240W Suitable for power applications Delivers stable performance during continuous operation Improved heat management for longer life Upgraded heat sink design for better heat dissipation Extends operational life under demanding conditions Flexible mounting and smooth control Smooth adjustable knob with an extralong screw for versatile mounting options Enables finetuned speed regulation Ideal for automotive fans and heaters, household appliances, and industrial small motor devices requiring variable speed management Compact, durable construction for retrofit and replacement ABS plastic housing Approximately 7 cm x 3 cm x 3 cm Lightweight yet long lasting Reliable functionality in tight spaces Suitable for retrofitting or replacing damaged speed switches in existing systems