Aerpro T20D24R Replacement Bulb 20mm Wedge Double Pole 24 LED Red CCA Power Cables Why is this switch needed

Why is this switch needed when installing an aftermarket head unit

sealed enclosures maximize the subwoofer's engineering strengths and sound quality characteristics

Remote Volume Control Included: (-50 ÷ 6) dB

Relay HB3 and H4 high-beam piggy back adaptors)

Aerpro T20D24R Replacement Bulb 20mm Wedge Double Pole 24 LED Red CCA Power Cables Why is this switch neededUpgrade Your Car's Lighting With Aerpro Direct Replacement LED Bulbs LED lighting is the way of the future, providing improved light output and reliability, backed with a significantly longer lifespan, saving you time and money replacing blown globes. Aerpro LED Bulbs are direct replacements for OEM Incandescent bulbs, making for a quick and easy install. Key Features: Replacement Bulbs 20Mm Wedge Double Pole 24 x Led Redsmd 5050 Stop And Tail (Dual