Infrared wireless headset for most TVs on the market. With voice clarity, tone (treble/normal/bass option), mono or stereo option and personal sound amplifier function. IMPORTANT! 1. Compatible with digital optical / analog RCA & 3.5mm audio connection. Perfect for streaming media playing from your Smart TV directly. 2.The infrared diodes on the transmitter must be in direct line-of-sight with the headset when using the system for best performance. There cannot be anything blocking the direct signal. 3.US standard power adapter only. 4.If you are not get used to this stethoscope design headset, you can consider simolio over-ear TV headphone or portable TV speaker. 5.Very helpful for the moderate hearing impaired people, but not recommend to severe hearing loss.