Features: With metal shell, delicate and textured, quickly export heat, refusing to burn. Let the traditional speaker realize BT5.2 function, and the computer/mobile phone/TV can be connection. Support high definitioned decoding. The Auditory is transmitted with hifi sound, and the sound is clearer and more delicate. With power isolation module can isolate the internal and external power supply grounding terminals, filter high-frequency interferences, and reduce noise and sound caused by common ground. Inside microphone, handsfree amplifies clear calls, hands on the steering wheel, safe driving. Specifications: Name: Auditory Receiver Version: v5.2 Appearance material: metal Call function: with call function Power supply: USB power supply Effective distance: about 10M Length of spring wire: straighten about 1.2m, dimension when it is not stretched: 30cm. Interfaces USB+3.5mm Noise: more than 90dB BT5.2 protocol: A2DP Frequency response: 20Hz-20kHz. Line length: about 0.3~1.2M/11.8x47.24in spring body Package Includes: 1PC USB Auditory Receiver note: Due to the problems of lighting effects, there will be certain tolerances in the product, please understand. Please allow 0-2mm error due to manual measurement.