Sabrent USB-DVR4 4-Channel USB 2.0 DVR Security Surveillance CCTV Digital Video Camera Recorder Adapter - VISTA Ready USB 2.0 4-Channel DVR Surveillance Adapter General Features: USB 2.0 interface Camera Inputs: Four (4) Composite Video RCA Audio Inputs: One (1) PC Audio RCA Audio Format: 8-bit, one channel Max. Display Rate: 25 fps (PAL), 30 fps (NTSC) Max. Recording Rate: 25 fps (PAL), 30 fps (NTSC) Compression Format: MPEG4 Video Resolution: 704 x 576 (D1), 352 x 288 (PAL), 640 x 480 (D1), 320 x 240 (NTSC)