The HARP® speech protector system has hemispherical coverage, which is a great improvement over the horizontal coverage that most gadgets use.
HARP® Discreet Mode: 3 to 5 metres (10 to 15 feet) radius of protection for microphones that are affected by this mode. (These are the average results we get in our lab for microphones that are affected by Discreet Mode. Because of the physics of ultrasonic waves, they don’t pass through obstacles.)
HARP® - Voice Mix Mode: 20 to 30 metres (60 to100 feet) radius of protection. Use your HARP® system’s two modes simultaneously for maximum protection.
(*The HARP® mini unit is equipped with Discreet Mode only, coverage details to be announced soon. One powerful mode that offers significant protection ideal for personal use.)