Brand: Zoweetek Mini Voice Amplifier Connectivity Technology USB Color: Rose Gold Power Source: Corded Electric Battery Powered Connector Type: USB Item Weight: 5.8 ounces Item Dimensions LxWxH: 4. 1 x 1. 4 x 3. 4 inches Specifications: Max output power: 10W Output Impedance: 4Ω Charging voltage: DC 5V 500mA Music-play time: 6-10 hours Work temperature: -10℃-45℃ Amplify time: 8-12 hours Charging time: 3-5 hours Frequency response: 90Hz-18KHz Sounds coverage: 1000㎡ Compatible Devices: Support recording MP3 playback AUX playback FM radio USB playback TF card playback(TF card is not included in the package) You can charge your voice amplifier using computer phone wall outlet power bank etc Portbale Lightweight and Compact: You can hang it around your waist with the included waistband belt. Wide Range Application: indoor outdoor party dance perfect for teachers coaches training presentation tour guide classrooms etc. Package: 1 x Z258RG Voice amplifier 1 x Wired microphone headset 1 x Adjustable Waistband 1 x US charger 1 x Mini charging cable 1 x User manual Note: The microphones must not be facing / close to the voice amplifier they need a certain distance to avoid noise and when the volume is turned to the maximum or interfered by some equipment it may generate static noise.