HD Bluetooth Module Wireless Upgrade Cable Bluetooth 5.2 HIFI Wireless Ear Hook Strong compatibility Small and light Comfortable wearing experience AAC Advanced Audio Coding Transmission Technology Dual-host Dual Channel *Note: This product is only for Bluetooth upgrade earhook, without earphones C PIN for ZSX / ZSN / ZSNPRO / ZS10 PRO / AS12 / AS16 / ZSN PRO X / ZAX / ASX / DQ6 / ASF B PIN for ZST/ZS10/AS10/BA10/ED12/ZSR/ES3/ES4 /ZST X/EDX/ AS06 Please do NOT use fast-charging adapters