Features:
  o Latches on short, open, or intermittent, in an eye-blink!
  o Visual and/or selective audible indicators.
  o Volume control.
  o Adjustable audio 'delay'.
  o Auto 'Reset'.
  o Uses a common Alkaline 9 volt battery.
  o Very low standby current.  Battery last a long time.
  o Components shown in the picture may not be exactly the same, like
    switch colors (pro version only), depending on availability.

Standard version: (0 in stock)  
    Not included in the kit: Battery, battery holder, knob, enclosure(case).

Professional version (0 in stock) 
    Includes these options: Enclosure (can be any color), Rocker Switch & LED, 
    Red/Black binding posts, Rectangular LED, Knob.  
    Not included: 9-volt alkaline battery.

Also, note that the enclosure has to be drilled and worked by yourself!

For the full article, check here: [Latching Continuity Tester]