1、The infrared host and transmitter are integrated, with clear sound quality and strong confidentiality. 2、Flexible to use, covers no blind spots, and has powerful functions that can be set up for online examination and simultaneous interpretation. 3、The emission panel is designed with special for Qualcomm infrared materials, which can advantageously filter the interference of external light. 4、Infrared emission, infrared earphone reception, infrared rays can not penetrate the wall, especially suitable for confidential examinations and meetings. 5、Transmitting power and use can be extended by multiple machines, wide&#8209;angle transmitting surface (&gt;150 degrees). 6、Has the dual use function of single machine and networking, one‑way, four‑way adjustable installation design, and for Bluetooth transmission function. Item Type: for Bluetooth Infrared Transmitter Input Impedance: 3.5KΩ (audio) 600Ω (microphone) Input Sensitivity: 30mV-1.5V Maximum Current: 500mA Maximum Output Power: 22mW Multiple Jacks: Such as ϕ3.5, ϕ6.3. extension port, RF port, etc. Mean Time Between Failures: >4000 hours Infrared Transmitter LED Tube Service Life: >10000 hours Launch Sector: Not less than 150 degrees Carrier Frequency Drift: <+/-10KH z Working temperature; <50℃ Infrared Effective Distance: Diameter: Approx. 30 meters / 98.4ft for Bluetooth Receiving Effective Distance: Approx. 15~20 meters / 49.2 ~ 65.6ft Suppression: 50dB Audio Signal to Noise Ratio: >40dB Channel Frequency: International 2.3MHz/2.8MHZ 1 x Transmitter 1 x Adapter 1 x Power Cord 1 x Screw Package