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While removing an ipod adapter I found (and removed) a small aftermarket box and puck antenna installed in the passenger footwell. It was attached to power off the lighter and ground (no other connections).
It is a black plastic box about 3"x4"x1/2" and has a label on the outside with the numbers 03901, 221, 5RLJ9901US, 028988F & 1.18 AND A BARCODE.
Inside is a printed circuit board with the numbers LAY4-AE and MS249E and a lithium battery.
The antenna is about 4" round and maybe 1/4" thick with the inscription 6000US.
No manufacturer name or logo and no other connections. Have no idea what it could be. Any thoughts?
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