This 4channel mobile dvr is specially made for Commerical Vehicle such as Trucks, Patrol cars, Bus, larger space type vehicle (Audio DVR optional, available). Can be used for individual car to do undercover surveillance as well. This mobile digital video recorder can store up to 16GB usb flash memory to store data/video. This unit comes with 8GB USB memory. Compact 4.5"W x 5.9"L x 2.1"D and easy installation with data management software & cd. Built in rechargeable battery just in case the ignition turns off. Battery last from 2hr-8hr varies on how many cameras was used at the time ignition shuts off otherwise power is power to car. Power: 10-30V DC. 1yr warranty. More info on mobile dvr

Item include:
4ch mobile DVR
CD-Rom
8GB USB Memory
Cable
Manual

Features:
Up to 4 cameras input
Storage device USB up to 16GB
Sturdy and Non shakey
Management software
Search & Playback
Built in Rechargeable battery for backup
Motion Detection, Continuous, Sensor

Specifications:
• Video input: 4ch NTSC / PAL
• Video Output: 1ch
• Audio Input (No, Varies on Model)
• Sensor Input: Yes, 1channel
• Tachnometer input: Yes, 1channel
• GPS Port: GPS module
• Video compression:own algorithm (similar to MPEG4)
• Recording Speed: Up to 12fps Varies on resolution setting
• Recording Mode: Continuous, sensor, motion
• Storage: USB flash memory stick
• Storage capacity: 2-3days w/4gb usb stick, 5-7days w/8gb usb stick, 10-14days w/16gb usb stick
• Power: built in Li-Polymer battery & 10-30 Volt DC
• Battery duration: 2-8hrs varies on camera input
• Dimension: 4.5x5.9x2.1 inches
• Weight: 1.3lbs
• Operation temperature: -5°c to +60°c (5°F to 140°F)
• Humity: Under 80%