... :256M 4 Channel 2.0 USB DVR Digital Video Audio Capture Adapter Description:Key Feature:Support Multi-channel displaySupport 320x240 / 640x480 ... back, pause, stop, fast-forward, single-frame play and image capture.Support alarm pre-record.Support buzzer, email alarm out.Can ... Frame rate per channel: 25 fps (PAL), 30 ftp (NTSC) Screen set: resolution 1024x768, color quality 16 bits or 32 bits ...