OMNITRONIC BHD-02 is a compact active waistband amplifier for voice reinforcement to audiences of up to 50 listeners. It features a 5 W RMS voice amplifier with volume and tone controls, a 3-inch woofer, condenser headset microphone, adjustable snap-in strap, and AUX line input via 3.5 mm stereo jack. The unit operates on six AA batteries and provides approximately 6–8 hours of operation. Its frequency range is 50–10,000 Hz.