Wireless Microphone on rechargable battery and charger. it can works for ... ,save huge cost on battery for you. Wireless Microphone,Teaching Microphone Wireless,USB Wireless Microphone,Bluetooth Wireless Microphone Function:1.Multichannels:It has more ... can work for 30 hours,standby time :60 days. For handsfree convenience, the 1090 with pendant type microphone If both hands ...