If you are still worrying about the leakage of personal privacy in various situations, this product can easily solve your problems. This product is lightweight, portable, and highly efficient in detecting wireless signals, can help you to eliminate all problems of privacy leaks. Features: Effective detection: It can effectively detect the range of 100-400 (MHz) within 32.8 inches. There is no dead space in 360 degree to protect your personal privacy. Widely applicable: Applicable to hotels, restaurants, public toilets, changing rooms, business negotiations, contract signing and may be a snooping device places. Quality assurance: Accurate and reliable, can work accurately. Simple operation: You can master it as long as you see it, you just need to pull up the antenna, press the key A for long distance search, press the key B for short distance search, suitable for varieties of people. Lightweight and portable: Small and exquisite, the antenna can be retracted and easy to carry. specifications: Material: Plastic Color: Black Weight: 30g Product Size: Approx. 6 * 4 * 0.7cm / 2.3 * 1.5 * 0.3In Packing Size: Approx.12 * 8 *3cm / 4.7 * 3.3 * 1.1In Antenna Extendable: 16cm / 6.2In Detection Band: 100-2400Mhz Working Range: 1m / 393.7In Working Voltage: 1.5v Battery: 12V/23A Dry Battery (Battery Containing) Packing List: 1* Detector 1* User Manual Instructions: 1. First pull out the antenna 2. When the "A" button is pressed and the indicator light is on, move left and right. When the radio wave is received, the sound will sound and the indicator light will flicker. The long distance (depending on the transmission power) will lock the emission area. 3. Press the "B" key continuously to search for a short distance. When a radio wave is received, the sound sounds and the indicator flashes. 4. When the "B" button is continuously pressed for a short distance search, if the distance exceeds 2 meters, the antenna may have large power or interference, and the antenna may be appropriately shortened. Note:The product battery is 12 V/23 dry battery and it can be replaced. In order to replace the battery, unscrew two screws to open the back cover of the device.1Effective detection: It can effectively detect the range of 100?400 (MHz) within 32.8 inches. There is no dead space in 360 degree to protect your personal privacy. 2Widely applicable: Applicable to hotels, restaurants, public toilets, changing rooms, business negotiations, contract signing and may be a snooping device places. 3Quality assurance: Accurate and reliable, can work accurately. 4Simple operation: Just look then master, you just need to pull up the antenna, press the key A for long distance search, press the key B for short distance search, suitable for varieties of people. 5Lightweight and portable: Small and exquisite, the antenna can be retracted and easy to carry.