A CMOS Sensor is an alternative to CCD sensors. CMOS sensors have a different method of transferring the image which is more battery efficient. As a result of operating at lower power, they are also more vulnerable to noise. CMOS sensors are less expensive to manufacture than CCD sensors, and are more common in inexpensive digital cameras. CMOS sensors were not used at all in camcorders until January 2005 in a new Sony camcorder.