hoco L22 Bright Lavalier Magnetic Wireless Dual Microphone with Charging Case and Receiver 1. Omnidirectional electret microphone with ENC noise cancellation for clear audio quality 2. Plug-and-play design for ease of use 3. Compatibility: USB-C compatible with most phones with a single USB-C port; 8 Pin compatible with iOS phones and tablets with an 8 Pin port 4. Receiver audio connector: Type-C (Type-C to 8 Pin adapter required) 5. Frequency response: 20Hz-20,000Hz 6. Sensitivity: -38dBFS 7. Signal-to-noise ratio: 65dBM with adaptive noise cancellation 8. Transmission range: 10-15m with no obstructions 9. Transmission frequency: 2402-2480MHz 10. Microphone battery capacity: 80mAh 11. Charging case battery capacity: 600mAh 12. Charging time: Approximately 2-3 hours 13. Use time: Approximately 5-6 hours 14. Material: ABS 15. Dimensions: 82.4 x 38.5 x 49mm 16. Weight: 91g