This device is designed to detect wireless signals in the frequency range of 100–2400 MHz. It is lightweight, portable, and easy to operate.Features: - Detection range: Up to 1 meter (39.4 inches) depending on signal strength. - 360-degree detection coverage. - Suitable for use in various environments including hotels, restaurants, public restrooms, changing rooms, and business settings. - Simple operation: Extend the antenna, press button A for extended-range detection or button B for close-range detection. - Compact design with retractable antenna; product size approx. 6 × 4 × 0.7 cm (2.3 × 1.5 × 0.3 in). - Weight: 30 g. - Power source: 12V/23A dry battery (included). Specifications: - Material: Plastic - Color: Black - Detection band: 100–2400 MHz - Operating voltage: 1.5 V - Antenna length (extended): 16 cm (6.2 in) - Packaging size: Approx. 12 × 8 × 3 cm (4.7 × 3.3 × 1.1 in) What’s included: - 1 × Signal detector - 1 × User manual Instructions: 1. Extend the antenna fully. 2. Press and hold button A to initiate long-range detection. When a signal is detected, an audible alert sounds and the indicator light flashes. 3. Press and hold button B for short-range detection. An audible alert and flashing indicator light indicate signal detection. 4. For optimal performance during short-range detection, adjust antenna length if interference occurs beyond 2 meters. Note: The device uses a replaceable 12V/23A dry battery. To replace the battery, remove the two screws on the back cover.