Color ClassificationA: CSR8675 whole machine blackB: CSR8675 whole machine whiteC: CSR8675 CPB without shellD: BM331 black machineE: BM331 CPB without shellComparative advantage:1: Bluetooth 5.0 versionOther: Bluetooth 2.0 or 3.0, dare not disclose the Bluetooth version2: British CSR8675 Bluetooth module, supporting APTX transmission. The advantage of supporting APTX HDaptX is that it can play 16-bit/44.1kHz audio in the way it transmits music. However, because aptX uses a compression method to reduce the audio encoding delay, it can only bring CD-like sound quality instead of true CD-level sound quality.The emergence of aptX HD is related to the increase in the popularity of high-definition audio. It can support audio up to 24-bit/48kHz, which means that we will be able to listen to music with better sound quality using wireless devices. Compared with the traditional aptX rate of 352kbps, aptX HD has an advantage in increasing the bit rate to 576kbps.3: Signal input and output all use fever components. Others: use common components and dare not disclose internal pictures.4: The digital output has a shaping chip and a digital isolation transformer.Other: no such function6: Coaxial and optical fiber output.8: Original software development, has its own Bluetooth nameOthers: using general software, poor stability9: Multi-channel independent voltage stabilization function + CLC filter, external mobile phone charger can be used The operation is very simple. After the mobile phone detects the Bluetooth device, press pairingPCB size: 80X60MMShell size: 68X20.5X86MM