SEVEN ZERO SEVEN Contact Bluetooth Helmet Communication System Two Seven Zero Seven Contact Communication Systems may be paired at once for intercom use 100 yard average effective range* between Seven Zero Seven Contact Communication Systems Auto re-connect between Seven Zero Seven Contact Communication Systems if disconnected while in use. (For example, exceeding effective range*) Full-duplex communication (Just like talking on the phone) Noise suppression microphone and high fidelity stereo speakers