First Steps - Steren CCTV-2120 Manual De Instrucciones

FIRST STEPS

Remove the screw from bottom of the sensor and remove the cover.
Pull out the brooch connector and connect a 9V battery, then set in
the interior of the compartment.
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If you want to select the Delay parameters, consult the Settings
jumpers. Then, set the cover of the sensor again and screw it firmly.