... C-45°C4,service time 10hours.5,microphone capacitance signal directivity.6,power supply 6v/800mA charger&DC1.2v* ... 5 battery7,output impedance 4Ω8,input signal microphone*19,material quality ABS10,shape size: 141*82 ... tear waistband. NOTE: you can choice diffrent color megaphone.THANK YOU VISITE.User's Manual:1,you find ... you power as gift.the power is isolated with megaphone when you charging.