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Please refer to the following product user manual http://www.jinlantrade.com/ebay/metaldetectormd3010/img.pdf Technical Parameters Battery: 6 x 1.5V AA alkaline batteries (Note: the battery is not allowed to ship by air mail, so the batteries is not included in the box sent to you) Operating current: Standby - 65mA, Max - 150mA Operating voltage range: 72 - 9.6V Operating frequency: 7.5KHZ +/- 1KHZ Sensitivety: Min. 8 inch (Test Coin: US ¢50) Audio frequency: 294HZ (re) 330HZ (me) 349HZ (fa) 392HZ (so) 440HZ (la) 494HZ (ti) 523HZ (do) Tempreture range: -20 ℃ - 60 ℃ Size: 540mm(L) x 345mm(W) x 150mm(H) Weight: 1.1 kg