2. 0.78mm 2Pin Connector: NICEHCK NX7/NX7 PRO/DB3/F3/NK10/FR12/SP12/ KZBA10/AS10/ZS10/ZSR/ZST/ED12/ES3/ES4/ KZED16/ZS7/ZS6/ZS5/ZS4/ZS3/ZSA/ZS3E/ CCAC04/C10/C16/C12/CA16 TRNBA5/V90/V10/V20/V30/V60/V80/IM1/IM2/X6 TFZ/ AUGLAMOUR / BQEYZ earphone and so on 2Pin connector earphone universal.
3. QDC 2Pin / 2 Pin Type C Connector: KZZSX/ZSN/ZSN PRO/ZS10 PRO/AS12/AS16/ QDC earphone/ CCACA4/A10/C12/CA16/ TRNBA5/VX earphone dedicated
4. NX7 2Pin Connector: NICEHCK NX7/NX7 PRO/DB3/F3/F4 / TFZ / AUGLAMOUR earphone dedicated (NX7 connector can use for BL-03, but will leave a little bit of plastic showing)