1.Its convenient use your PDA charge in the car USB outlet can use for other digital machine such as mobile-phone,MP3,MP4,camera ect 2.LED indicate show the car charger on working 3.Short Circuit Protection (Auto recovery) 4.input:11-24V 5.output:5V500mA or 5V1A or 5V1.5A or 5V2A or 9.5V2.3A or 12V3A or 5V650mA or 9V650mA 12V1.5A available Plastic bag or Blister packing