Product information: Parameters: Detect Dynamic Range: Greater than 73DB Detection Sensitivity: Lower than 0.03mw Alarm: Sound alarm with LED flashes Sound Alarm Method: As close to the object the alarm sound will rapidly LED Indication Mode: 10 level LED lighting indication Battery: 1000mah 3.7V Lithium battery Power Supply: DC 5V 1000mah Material: Aluminum alloy Working Current: 30mA Working Time: 12 - 15 hours How to Use? Please move the power switch to "ON" position to power on the device, and press the "UP" button to increase sensitivity, press "DOWN" button to decrease sensitivity, close the detector to your cell phone, if the detector LED light flashes, you can handle the detector close to object area to inspection, if the detector LED light does not flash, you can rotate the knob to turn the fourth LED light on, increase the sensitive, then you can get the best performance, please do not turn the tenth LED light on, it will reached the maximum sensitivity, the device will alarm immediately. Packing list: Detector *1 Product Image: