1. Double antenna reception, the signal is stronger and more stable 2. High sensitivity and stronger directivity 3. Use high-quality metal mesh head to effectively protect the sound head module that converts sound into audio signal 4. Built-in high-sensitivity sound head, strong pickup 5. Sound filter cotton is installed inside the mesh head to effectively filter external noise 6. Anti-skid pad on the bottom 7. Working temperature: -30 to 60 degrees Celsius 8. Working range: 2-50 meters 9. Audio response: 80-18000Hz 10. Working current: host: 200mA, microphone: 100mA 11. Sensitivity: 12 decibels 12. Host adapter: input: AC 110V, output: DC 12V / 1A 13. Microphone power supply: 2 AA batteries (need to buy by yourself) 14. Product list: power supply + 6.35mm audio cable + conversion plug + manual + host + microphone 15. Dimensions: host 13.5x4.5x19.5cm, microphone: 24.6x5cm 16. Weight: 1.15 kg (1 set)