Features: 1. Equipped with bt 5.4 chip, the connection is more stable and effectively solves the problems of disconnection and lagging. 2. Supports lossless decoding and playback of multiple audio formats such as AAC/MP3/WAV/FLAC/APE. 3. Supports direct playback from USB flash drives and TF cards, with playback memory function and convenient use. 4. Multiple power supply methods: Type-C, power bank, DIY battery, suitable for various scenarios. 5. Built in FM radio function, professional antenna layout, stronger and clearer signal reception. Parameters: Product Name: bt 5.4 Audio Receiver Function: bt reception, USB/TF playback/reception function/ Decoding: AAC/MP3/WAV/FLAC/APE bt Name: WSn6688 bt version: 5.4 Radio frequency: 87.5MHz-108Mhz Audio output: 3.5mm AUX audio standard interface, available for car AUX The USB TF card supports FAT32 and eXFAT formats, but does not support NTFS (which can format FAT playback) USB TF card