KJB Security C1253 Wireless Bottom View Smoke Detector Camera Camera Specs: Image Sensor: 1/4" micron sensor Video System: NTSC Resolution: 320x240 pixels S/N Ratio: &gt;45 db Sensitivity: &gt;11.5V/lux-s @ 550nm White Balance: Auto Tracking USB Receiver Specs: Frequency: 2.4GHz Antenna: Dipole antenna Modulation: GFSK, FHSS (digital) Compatibility: Currently the USB Receiver is NOT supported by Windows 7. Power: USB bus power Size: 3.3" x 1.2" x .39" Weight: 0.56oz