Airport body Checking MD-300 1.alarm methods:light /voice/vibration 2.low battery indication 3.Senser sensitivity:8cm Hand ... price has advantage. 6, It has a sound, light alarm, and vibration alarm. 7, It is the only metal detector detecting non-magnetic ... batteries laminated 9 v 3, sealing performance: IP64 4, alarm mode: synchronized alarm of light and sound, vibration alarm. 5, weight: 260 g