Products descriptions: Professional pen DVR for the professional investigators or law enforcement agencies With high quality video and audio with real time date and time stamping for the evidence in the court Built-in 4GB memory, gives 16-hour audio/video recording in AVI format which is acceptable for the evidence in court or in police and army departments Super sensitive microphone can record the voice in a range of 9sqm With delicate outline, fluent writing function, and changeable pen filling is super vivid, long time used Specifications: Real-time date and time stamping Built-in 1/2/4/8GB memory Video: 300 to 3,000K pixels, AVI format Built-in microphone Normal size pen with handwriting function Built-in lithium battery can recording for 2 hours if the battery is full charged High speed USB 2.0 interface Portable U-disk function Supports firmware upgrade Packing includes: Pen DVR User's manual Emergency charger USB connector Charger connector 2 pieces extra refills for the pen Nice gift box Parameters: Lens: 1/6-inch color CMOS, pinhole lens f2.36mm/f1.76 Auto gain control: yes Auto white balance: yes Video rate/size: 15fps, 250MB/hour Video resolution: CIF 352 x 288 and 640 x 480 pixels Product applications: Police can use it to law enforcement Lawyers can used it to collect evidence Reporter can used it to interviewed in special occasion For stealth surveillance