Stereo Integrated Amplifier 1.Certificate:ISO 9001:2000 2.Technology:bluetooth 3.Input:amplifier DC6V 4.Plug:USB,6.35mm jack Stereo Integrated AmplifierFeature/Function:1.Technology:Built - in 2.4G wireless digital receiver.2.Channels:Digital frequency wireless channel is more than 1000pieces.3.Linking time:The transmitter connect with receiver is less than 3seconds.4.Connector:RS232 jack,could ...