·Operating frequency: 95kHz
·Operating temperature: -20 - 45^oC
·Indicators: Audible-speaker with red LED
·Three-position switch with selection of visible alarm or audible and
 visible alarm, and power supply controlling is convenient, smart, fast
·Optional earpiece output for audible alarm, available in noisy and
 quiet environment
·Tone identification: making use of the character of ATD, the machine
 only makes audio-frequency change when you detect small metal
 articles. But make audio-frequency change & tone change
 simultaneously when detecting big articles
·Reset function: put the key gently to make the machine to the work
 waiting state. Especially using when appear false alarm or the
 temperature of detecting environment changed
·Low voltage indicators: continuous alarm, green light stop flashing,
 and red light flash

·Weight: about 350g
·Sealing performance: IP64
·Battery: 1 x 9V dry battery