ALLOSUN TS80A Security Wand Handheld Metal Detector, Black Power supplied by 1 pieces 9V, 6F22 battery or equivalent. Application: airports, industrial sites, government buildings, schools, hospitals, conferences, nightclubs, Sport Events, and anywhere you need security. A sound & Red LED lights will indicate when the Detector detects metal. The earphone Jack lets you connect the earphone to the Detector so that you can scan in privacy. Sensitivity: A 25 cent coin(USD) is about 60mm;Iron pipe of 20mm is about 100mm. Foldable Design Sensitivity can be adjust LED and sound indicator <span class="a-text-bold">Sensitivity</span>: <span class="a-text-bold">Operating Environment:</span> -10~+50 ,&lt;85%RH <span class="a-text-bold">Quiescent Operating Current:</span> &lt;6mA <span class="a-text-bold">Weight:</span> About 230g <span class="a-text-bold">Length:</span> 395mm(in use) 260mm(in storage) <span class="a-text-bold">Battery:</span> 9V,6F22 or equivalent(Not Provided by seller) <span class="a-text-bold">Operating Frequency:</span> About 28kHz <span class="a-text-bold">Tuning:</span> Automatic <span class="a-text-bold">Alarm:</span> LED light&amp;audio/vibration Manual book Headphone