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Drops line continuity to the starter motor or fuel pump circuit. Auto-protection timer.
Includes a wireless or wired backup battery siren that activates if cables are cut or the main power is disconnected.
: This means it is an "upgrade" system that adds alarm functionality to a vehicle that already has a factory-fitted immobilizer. Siren-Integrated "Brain" : Unlike many alarms with a separate control module, the Cobra 3865 houses its primary electronics directly inside the siren unit for simplified installation and space-saving. Perimetric & Volumetric Protection Perimetric cobra 3865 manual exclusive
: Easier integration with various vehicle makes and models.
: If your siren does not "chirp" during arming, this can often be toggled in the programming menu of the installation manual. Drops line continuity to the starter motor or
| Line/Function | How to Change | Effect | | :--- | :--- | :--- | | | Press the "A" button once. | - LED flashes slow 🟢: Function Active - LED flashes fast 🔴: Function Inactive | | Line 2 - Passive Arming | Press the "A" button twice. | - LED flashes slow: Active (arms 30 sec. after ignition off) - LED flashes fast: Inactive | | Line 3 - Central Locking | Press the "A" button three times. | - LED flashes slow: Active (locks/unlocks with alarm) - LED flashes fast: Inactive | | Line 4 - Siren Duration | Press the "A" button four times. | - LED flashes slow: Extended / 120 sec. - LED flashes fast: Standard / 60 sec. | | Line 5 - Sensor Sensitivity | Press the "A" button five times. | - LED flashes slow: High Sensitivity - LED flashes fast: Low Sensitivity |
Press the "Unlock" button on your vehicle’s remote control. : This means it is an "upgrade" system
| Specification | Expected Value | | :--- | :--- | | | 26.965 MHz to 27.405 MHz | | Channels | 40 (AM) | | Power Requirement | 13.8V DC (Negative ground) | | Current Drain | 500 mA (Standby) / 1.5A (Transmit) | | RF Output Power | 4 Watts (Legal limit) | | Antenna Connector | SO-239 (Standard UHF female) | | Dimensions (WxDxH) | Approx. 6.5” x 7.5” x 2.25” |
