Stores also sell smart appliances, digital cameras, camcorders, cell phones, and smartphones. Another factor in digital cameras and camcorders is lens resolution. The same is true for projectors, and other optical devices such as cameras, camcorders, etc. All known images were produced using a variety of commercially available camcorders and cameras. Version 6 also added the ability to capture from Sony Handycam DVD camcorders. Most AVCHD camcorders record audio using Dolby Digital (AC-3) compression scheme. JVC later invented hard drive camcorders. MOD and TOD are recording formats for use in consumer digital file-based camcorders. AVCHD was originally developed as a high-definition format for consumer tapeless camcorders. Digital Video (DV) is a standard protocol used by some digital camcorders. MPEG-1 Audio Layer II is the audio format used in HDV camcorders. Since 2006, nearly all camcorders sold are digital. This feature is unique to Sony camcorders. SuperBeta and industrial Betamovie camcorders would also be sold by Sony. This is a list of Panasonic camcorders.