Also called a mobile phone car kit, a hands-free kit contain both a speaker and a microphone to allow cellphone users to use their cellphone while driving, without using their hands to operate the device. Some kits may also come with a cellphone holder or cradle, and power supply cables and connectors. Hands-free kit cane be hard-wired into the vehicle's electronics or be a portable kit which uses the 12V power adapter found in most vehicles.
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