Specifications: Output power: 12W Charging voltage: DC 5V 1A Music time: 6-8 hours Frequency response: 50Hz-15000Hz Working temperature: -10℃~45℃Amplifier usage: 6-8 hours Charging time: 4 hours Package includes: 1 x Voice Amplifier 1 x Wired Microphone Headset 1 x Waistband 1 x USB Cable User Manual Note: If you have a howling, reduce the volume and prevent interference Separate machine and microphone Please contact us. It is recommended that you charge it after it has been used out. If you dont use it for a long time, you need to charge it once a week. This is a black amplifier. If you need red or blue, please contact us.