• PRODUCT PLUG and play DOES NOT REQUIRE ANY CONNECTION 1. Material: ABS+TPU 2. Wireless transmission: 2.4 GHZ 3. Sampling frequency: 48 KHz 4. Sampling depth: 24 bits 5. Sound delay: 22 ms 6. Charging current: DC 5 V/1 A 7. Charging time: 1.5 hours for microphone, 2.4 hours for charging box 8. Microphone battery capacity: 70 mAh 9. Charging box battery capacity: 600 mAh 10. Working life: Approximately 6 hours for single microphone use/24 hours for charging case 11. Two for one, two microphones can receive sound at the same time 12. Magnetic button design, mini and portable, senseless wear 13. Sound quality at CD level equipped with noise reduction and reverberation function 14. 100 meters long distance audio reception, 360-degree omni-directional microphone