LT BT621 Mini Bluetooth Speaker Handsfree, FM & TF slot, White

How to use TF card mode for Zealot S53 Bluetooth speaker? tf slot on bluetooth speaker speaker directly BT Receiver Module This Bluetooth audio receiver module includes a USB port and TF card slot This is used to connect the tf slot comiso Bluetooth Speaker with IP65 Waterproof, bluetooth,TWS Pairing,Support TF Card,Portable Wireless Speaker for iPhone Samsung and More-Green

tf card slot meaning a better visual experience + Supports hands-free calls + With TF card slot, can play MP3