Jensen BT-390 - Manual (Page 11)

2. Installation
Attaching the remote control
Refer to the following to attach the control module:
1. Attach the rubber clasp to the two notches on one side
of the bracket base.
2. Pull tightly on the rubber clasp by holding it firmly from
the middle and position the bracket base on the inside of
the steering wheel.
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3. Wrap the rubber clasp tightly around the steering wheel
and secure it on the other two notches on the bracket
base.