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2 AA Batteries required
The GROMKEY Booster is housed in a light weight ABS enclosure. It was developed to be used with metal detectors to provide sound amplification with user adjustable volume control. It also features a user operated bypass switch (Boost On/Off).
The GROMKEY Booster is designed to accept a standard 1/4 inch (6.35mm) plug from a head phone or an extension speaker. It is powered by 2 AA Batteries.