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SHIDU 10W Portable Voice Amplifier Wireless/Wired Microphone Specifications: 1. Output Power: 10W 2. Charging Voltage: DC 5V, 500Ma 3. Lithium Battery: 3.7V/1800Mah 4. Working Time:With 50% Volume 6~10 Hours (Musical Mode), 8~12 Hours (Mic Mode) 5. Charging Time: 3-5 Hours 6. Product Size: 106*86*42mm 7. Unit Weight: 170g 8. Working Temperature: -10℃~45℃ 9. Frequency Response: 90Hz~hz 10. Sound Coverage: 400㎡ 11. Wireless Distance:30-35M Main featuers: 1. SHIDU Patented Appearance; 2. Stylish, Ergonomic And Comfortable Design; 3. High Power Double Magnetic Trumpet --- More Clear And Penetrating; 4. 5W Power Output, Sound Coverage Up To 400㎡; 5. Adopt Shidu Acoustic Amplification Electroacoustic System; 6. Equipped With Shidu Special Acoustic Microphone --- Hi Fi Original Sound Amplification; 7. Super Mp3 Audio Encoding Technology --- Support Tf Card U Flash Disk; 8. Headset  Wireless Mic With Built-In 380Mah Lithume Battery; Standard Package: 1 * Main hine 1 * Waistband 1 * SHIDU  Wireless/Wired Microphone 1 * USB Charging Cable 1 * User Manual SHIDU Portable Voice Amplifier Wireless Microphone SHIDU Portable Voice Amplifier Wired Microphone