Made of fine quality material, practical, easy to operate and use, wide application range, has a long service life.<br /> <br /> <b>Specifications:</b><br /> Material: PCB<br /> Color: green<br /> Item size: 105 * 36 * 28mm / 4.1 * 1.4 * 1.1in<br /> Item weight: 20g / 0.7ounce<br /> Package size: 110 * 40 * 30mm / 4.3 * 1.6 * 1.2in<br /> Package weight: 30g / 1.1ounce<br /> <br /> <b>How to use:</b><br /> Powered by USB interface, you can use any USB port output recharger for power supply. The A key is used to select the sound mode, 1 is the granular sound mode (click-click), 2 is the alarm sound mode (alarm when the real-time value is greater than 0.5, beep-beep), 3 is the silent mode. The B key is used to start the mean test function. When the average calculation is started, the second row of the LCD screen displays "--.--" and the average icon displays "s". After about 5 minutes, the average calculation ends and the second row displays the average result "xx.xx", and the average icon displays "o".<br /> <br /> <b>Packing List:</b><br /> 1 * Geiger Counter<br /> 1 * USB Cable