HD Stereo & Anti-Call Echo Design Wearable wireless bluetooth speaker has a dual speaker system, which can provide clear treble and dynamic bass, thereby producing a complete stereo. both sides equipped with echo cancellers to eliminate the echo during a call and improve the clarity. Package Included1* neckband speaker; 1*type-c charing cable; 1*user manual Bluetooth 5.0, Built-in Mic , TF/SD card slotAdvanced Bluetooth 5.0 chip, ensures stable transmission up to 33 ft (10m) long range. Support SBC/AAC decoding, support A2DP/HSP/HFP/AVRCP protocol. compatible with all Bluetooth-enabled devices such as smartphones, tablets, laptops, TVs, etc. give you stable connection, you can also use theTF/SD card(max 32g) slot to enjoy good sound quality music everywhere. Bluetooth 5.0, Built-in Mic , TF/SD card slotAdvanced Bluetooth 5.0 chip, ensures stable transmission up to 33 ft (10m) long range. Support SBC/AAC decoding, support A2DP/HSP/HFP/AVRCP protocol. compatible with