Wireless Mini Entry Alarm GreenBlue GB3400 — battery powered portable entry sensor, compact design

The GreenBlue GB3400 is a wireless mini entry alarm designed as a battery-powered portable sensor for doors, windows and other small openings. Its compact design allows for quick placement without wiring, delivering an immediate audible alert when the sensor detects unauthorized opening. The device is suitable for short-term use during travel and temporary stays as well as for permanent placement in homes, offices or storage areas where a simple, independent alarm is required.

Advantages

The GB3400 combines compact dimensions with battery operation to provide a maintenance-light security solution that requires no electrical installation. Its wireless nature and small footprint make it unobtrusive and easy to relocate. The unit produces a clear audible alarm on activation and is designed for straightforward one-person installation and removal. Low power consumption extends battery life, and the durable casing supports everyday indoor use.

Suitable for

• Doors and entryways in homes and apartments
• Windows, balcony and patio doors
• Office rooms, cabinets and small storage areas
• Temporary protection when travelling or staying in rentals
• Supplementary alarm for sheds, garages or garden houses

Key specifications

• Power source: battery powered for independent operation
• Type: wireless magnetic entry sensor with audible alarm
• Design: compact and portable housing for easy placement
• Installation: adhesive or screw mounting options for doors or frames
• Alarm output: immediate audible alert on contact break
• Intended use: indoor environments such as homes, offices and travel accommodations

How to use

Mount the sensor and the magnet element on corresponding parts of the door and frame or window sash and frame, maintaining the recommended alignment and distance between the two parts. Install batteries according to the polarity markings, then test the unit by opening the protected entry to trigger the alarm. For temporary use, attach the sensor with adhesive pads; for long-term installation, secure the device with screws if provided. Periodically check the battery and test the alarm to ensure reliable operation.

Usage recommendations

Place the sensor on solid, dry surfaces and avoid locations exposed to heavy direct moisture or extreme temperatures. Verify alignment after repeated door or window movement and replace batteries promptly when alarm volume weakens. Use the device as a supplementary alarm and not as a substitute for comprehensive security systems when higher levels of protection are required.