Bluetooth : - Bluetooth 3.0 - High Quality Wireless Audio Transmission through Bluetooth A2DP Profile - Over 10m Transmission Distance Microphone: - High Performance UHF Wireless Microphone - Over 10dBm Output Power - High Sensitivity Dynamic Microphone - 2200mAh Rechargeable Li-ion Battery - 18 Hours Operation Time - Automatic Power Off if No Voice Input for Over 10 Minutes - Low Battery Indicator - Over 50m Transmission Distance Receiver: - 100Hz ~ 13kHz Audio Frequency Response - Over 80dB Dynamic Range - 2 Channels Wireless Microphone - Bluetooth & RCA Audio Input - Multiple Sound Effects (Conference/Karaoke/Bass/Treble)