1.Wide frequency response range, ultra low distortion, strong bass, bright mid-range and clear tre2. With perfect switching noise elimination circuit to avoid a huge impact sound when you turning on t3. Perfect working status indication and handheld microphone instructions (replace new batteries when indicator gets darker). The device to ensure power amplifier system and loudspeaker safeble. 4. Ideal environment practical distance is app. 100M. 6. Multi-channel design, you can use two or four handheld microphones at the same time but no interfering. 5. Multi-output circuit design, you can connect more than two power amplifiers or mixing consoles. ?1* Receiver, 1* Male to Male Cable, 1* User Manual, 1* Adapter, 2* Wireless Microphone