K9 Wireless Bluetooth Microphone Mobile Phone Sing Microphone 1. Material: ABS 3. Charging power: DC5V 4. Battery capacity: 1800mAh 5. Bluetooth version: 5.0 6. Transmission distance: about 10m without obstacles 7. Pickup: capacitive 8. Rated power: 6W 9. Frequency response: 100Hz-10KHz 10. Use time: about 3-6h 11. Charging port: Micro USB 12. Reverb mode: echo sound effect reverb 13. Size: about 24.5 x 7.7 x 6.6cm Features: 1. Support two microphones wireless interconnection, to achieve two people wireless chorus 2. 5.0 Bluetooth stable connection, monitor ear, listen and sing, wireless Karaoke, HIFI speakers, cell phone APP recording songs, plug-in playback, reverb adjustment 3. Microphone audio integrated, intelligent noise reduction, clear radio, prevent whistling 4. One key to eliminate the original song 5. Built-in 5 kinds of sound effects, one key to switch the doll voice strange sound male voice female voice original voice 6. Using high-performance technology OSP audio processing technology, powerful algorithms to quickly process a variety of digital signals