Range View larger Range The transmitter from several of our monitors send a high quality stereo signal which can be received by the HP30 wireless infrared headphones. The best sound will be obtained if you sit directly in front of the monitor, within 6 feet. If you choose to sit on either side of the monitor you can expect the same great reception within 35 degrees to the left or the right of the monitor. Dual Channel The HP30 has the ability receive two separate signals from two separate video units. Say you have a couple of passengers who want to see their own videos. One flips to channel A and views/listens to one unit, while the second flips to channel B and views/listens to another video. You can also pick up both channels A and B with just one pair of headphones. Installation Precautions Do not install components in areas which are susceptible to rain, moisture, direct sunlight, extreme heat or cold, excessive dust, dirt, or humidity.Use only the installation parts and hardware provided with the unit to insure proper installation. Using other parts can cause malfunction and possible damage to your headphones.Use only a power source with 12 volts DC (negative ground).Before final installation, temporarily connect the wiring according to the diagram provided in your user manual and check it to ensure that it has been connected properly as well as tested. View larger Specifications Transmission system: Infrared lightCarrier frequencies: 2.3/3.2MHz (left channel) - 2.8/3.8MHz (right channel)Distortion: Less than 1%S/N ratio: Greater than 60 dBChannel separation: Greater than 40 dBFrequency response: 30Hz – 20KHzPower source: 2 x AAA batteriesCurrent consumption: 25 mA max (during play) / 15 mA (muted)