Product features: flame-retardant materials are odorless and durable Installation: Please use a hole opener to open the hole, put the product in, and then unscrew the screw fixing ring Application: input 12 - 24 V output 5 V / 4.2 A fast charging mobile phones, tablets, GPS and other devices. Universally applicable to all 12 V-24 V cars, buses, testers, boats, utv, atv, etc. Protection: With overcharge protection function, when the device battery is fully charged, it can automatically stop charging, overheat protection, overvoltage protection. colour:Black Material:nylon Package Contents: 1 x Dual USB Car 2 x terminals Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.