Product name: Bus, RV and truck modified mobile phone charger QC3.0+PD3.0+PD3.0 input 12-24V Product model: SKU2024-QPP Product weight and accessories: 45g Voltage meter material: environmentally friendly flame-retardant nylon material, copper Output QC3.0+PD3.0 (QC3.0:18W) (PD3.0:36W) Reverse polarity protection This product has reverse polarity protection. Product line length: With 12cm connecting cable Input voltage: 12-24V Product Usage: Supports charging of mobile phones, tablets, and car electrical appliances. It can be installed and used on all vehicles with working voltage 12V-24V. Wiring instructions: The red wire is connected to the positive pole of the power supply, and the black wire is connected to the negative pole of the power supply. Features: Flame retardant nylon material is odorless and durab. Installation method: First look at the small round hole, put the wire down, and tighten the screws.