Description: 5.0 Version: Conforms to version 5.0 specifications, backward compatible with 4.2 / 4.1 / 4.0 / 3.0 / 2.0 / 1.0. Transmitter Receiver: Universal audio adapter can make your TV and other devices have function to stream audio to headset, or make your home stereo function can receive wireless music from mobile phones and flow. Use with devices with 3.5mm ports. Support Hands-free Calling: When in receiving mode, support incoming call answering/hanging up, etc. Support NFC: Built-in chip, you can directly connect with NFC mobile phone or other devices that support NFC by touching this receiver. Support Dual Audio Ports for Connection: 3.5mm and 2RCA audio ports are included, suitable for more devices (including 3.5mm cables and 2RCA cables). Specification: Size: 80x20mm/3.15x0.78 inches Type NFC receiver transmitter Version V5.0+EDR Interface Atereo analog/AUX3.5mm Frequency Response Range 10Hz-20KHz Output Impedance 75Ω Effective Distance 15 meters Signal to Noise Ratio >90dB Performance HiFi level Distortion + Noise