Adjustable sound-activated noise monitor. When the noise exceeds the appropriate sound level, let the Yacker Tracker be an audio-visual reminder to your group. Other features: adjustable lights and sound levels, optional siren, self-standing or wall-mounted, spare light bulbs and AC adapter included. 5-1⁄2"x 17". No. 400116 Replacement Bulbs (set of 6)
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