Features: 1. Uses cycle-switch to switch sound alarm and hidden vibration alarm respectively. 2. Highly sensitive, detects ferrous metal and non-ferrous metal. 3. Sound and light alarm simultaneously. 4. Alkaline cell (7 to 9V) can work over 40 hours and distance does not change. 5. Warn automatically when short of voltage.
Buzzer or Vibration motor
Red LED on: alarm; Green LED on: low voltage
9V battery for 40 hours working MD100/MD200 with built-in battery charger MD300/MD400/MD500 external battery charger
Cycle-switch for sound or vibration
a) 1/2 pin: 10mm b) Model 64 pistol: 150mm c) 6" dagger: 150mm d) 8mm (diameter): 40mm e) Aluminum & copper sheet: 10mm f) DIP14 IC (integrate circuit): 5mm g) Silver Ring (1g): 40mm h) Lead Brick (1g): 30mm