... high vioce,can bring good voice pickup to users.Designed with advanced wireless technology , make you get rid off wired amplifier from ... receive, be cost-effective for you.8.Easy to use,with long distance transmit9.Using built-in FM antenna, save the space 10 ... Charger: DC 10.5V/400mAFrequency Response: 70Hz-12 kHz Battery Working Time: 16H continuous (related to the volume and temperature)Output ...