United States 
Conceptus Bite Switch
Product description:See Tongue switch here..
Mono Plug-Many users prefer the "mono" plug, which activates the camera's autofocus and light-metering functions whenever the camera is turned on and the switch plugged in. This results in a very quick shutter reaction time, however the constant autofocusing increases battery consumption.
Stereo Plug-Photographers who prefer autofocusing and metering with each individual exposure should choose their switch with a "stereo" plug. This does conserve battery power, but it also slows down reaction time somewhat depending on the auto-focusing and metering speed. Either type will work with our recommended camera configuration in which the camera is manually focused at the expected distance of the subject and the focus ring taped down.More info on plug types
The Bite Switch is comprised of a durable, sealed tubular switch assembly measuring 1.5 inches long by 1/4 inch diameter, a 36 inch coaxial wire, and a 2.5mm plug with a 90 degree elbow bend. During use, the switch is placed in the mouth with the wire pointing either to the right or left. Biting anywhere on the red section ("bite zone") actuates the switch and triggers the camera. There are two tactile ribs so the user can instantly feel the bite zone with their teeth and lips. The required bite force is about what it would take to bite through a small carrot, or about how hard the average person can comfortably bite on their own finger without pain. The actual depression of the switch mechanism is only about 1/8", so very little jaw movement is needed. As a result, helmet motion is extremely small. Nonetheless, the Bite Switch works best when used with open-faced helmets or helmets with chin cups allowing the user to open and close the mouth at least to a small degree. It should always be bitten only with the front
For more information on these switches click on the following links
Plug Types
Operation Instructions
Trouble Shooting
Custom Connections
