It weighs 20 grams, in the lower part there is a hole where to add any weights with a karabiner for ballast.
Use 3 button cells (LR 44 the most economic, common, and available) whereas only lights up when you tilt, will report thousands of bites with few euro. In case your prey both of good size, even in the escape alarm is wrong to hinder the unwinding of the wire, because after having tilted and turned on it slips.
Prices vary only to the different costs of LEDs, are delivered assembled, including three stacks.
The various applications:
To turn on and off is used a magnet of circular form, also visible in the illustration, they slide it towards the top and shuts the appliance, so there are no sheets interuttori that with the saltiness the dew freeze or deteriorate, is the force magnetism that locks and unlocks the operation within