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usually the altima comes with a security system, which also doubles as a keyless.. at least my gxe did.. anyway, several systems are available and very inexpensive... i always sold and installed ungo... usually around $99 installed at most higher end car audio shops.. the higher the price the more options it may provide.. ie: rolling up/down windows, sunroof, horn honk, etc.. but basic function of unlocking/locking doors most of them do! i hope this helps?!
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