Body Worn Spy Camera System

Here I find a body worn camera. It almost fits to my requirements for worn photo camera, but I could not understand why it's so expensive. Today 3Mp camera costs 7 times less.

DVR Specifications Capacity: 30 GB Hard Drive to store up to 40 Movies, 300 000 photos or 15 000 songs1

Display: 3.5'' TFT (320X240 pixels) 4/3, over 16 million colors

Video playback: MPEG-42 (ASP@L5 AVI, up to DVD resolution)
WMV (MP@ML, up to DVD resolution).
With optional software plug-ins:
- H.264 up to DVD resolution and AAC sound.
- MPEG-2 MP@ML up to 10 Mbps (up to DVD resolution) and AC3 stereo sound.

Audio playback**: Stereo MP3 decoding @ 30-320 Kbits/s CBR & VBR, WMA, Protected WMA, WAV (PCM/ADPCM).
With optional software plug-ins:
- AAC3 music files
- AC3 stereo sound files

Photo viewer: JPEG, BMP, PNG
Transfer directly your photos from a digital camera with the optional Docking adapter

PDF viewer: Reads PDF documents. May not implement all PDF features;

Video recording: Via the optional DVR Station: record in MPEG-4 SP with ADPCM stereo sound, resolution VGA (640x480) @ 30 or 25 f/s, in AVI format.

Audio recording: Voice recording through the built-in Microphone
Via the optional DVR travel adapter or DVR Station: stereo line-in, WAV (IMA ADPCM or PCM) format.

Interfaces: USB 2.0 High-Speed Device (compatible USB 1.1): Mass Storage class (MSC) and Media Transport Protocol (MTP).
USB 2.0 Host : Mass Storage class (MSC) and Picture Transfer Protocol (PTP) (with optional docking adapter).

Connections: 3.5 mm stereo headphone mini-jack and TV output (AV cable sold separately).
Dedicated connectors to connect optional adapters and DVR station.

Battery life Music playback time: up to 12 hours5.
Video playback time: up to 4 hours5 on built-in LCD

Power source: Internal: Lithium-Ion Polymer battery.
External: charges via computer USB port, or faster with the optional docking adapter or DVR Station.

Scalability: Download firmware updates available

Dimensions & weight: Approx. 100 x 78 x 15 mm – 3.9” x 3” x 0.59”
Approx. 190 gr. - 6.75 oz

Package includes: DVR, headphones, dedicated USB 2.0 cable, DVR station adapter, pouch, QSG, legal and safety notice.

Minimum system requirements: For PC: Windows ME, 2000, XP, Media Center; Macintosh®: OS X or higher (with USB Mass Storage Class support), Linux (with mass storage device support), USB port.
For PlaysForSureTM video and subscription services: PC with Windows® XP SP 2 or higher, Windows® Media Player 10 or higher, USB 2.0 port.