Car 24V step-down 24V to 12V reduction is suitable for buses, coaches, trucks and other 24V large vehicles. The 12V reduction is used for on-board equipment such as on-board surveillance cameras and on-board displays. On-board cameras, car audio, DVD, etc. need to be reduced to 12V before equipment can be used. When installing wiring, be sure to pay attention to positive and negative poles (red connects to positive, black connects to negative). The input end is labeled Input voltage: 24V Output voltage: 12V Output current: 2A Colour:Black Material:plastic Size:22cm long Package Contents: 1 x Transformer Only above package content, other products are not included. Note: Light reflection and different displays may cause color of item in picture a little different from real thing. The measurement allowed error is +/- 1-3cm.