#Portable Audio & Video

Consumer Electronics

Bluetooth 5.4 Wireless Upgrade Cable with Ear Hooks and Charging Case for KZ ZSX, ZAR, PR2 — Check the 2-Pin Size

If you already own a pair of KZ in-ear monitors, a Bluetooth upgrade cable is a cheaper way to make them wireless than buying new true-wireless buds — but the fit comes down to two small details. This KZ AE01 is a Bluetooth 5.4 wireless upgrade cable with ear hooks and a charging case, listed for the ZSX, ZAR and PR2. First the connector: KZ earphones use a two-pin socket, and the pins come in slightly different sizes, with 0.75 mm and 0.78 mm both common, while some models have a recessed socket that needs a matching connector housing. Confirm the exact pin size and whether your model's socket is flush or recessed, because a loose pin gives you a channel that cuts in and out. Second the wireless side: check which Bluetooth codecs the module supports, since that decides both sound quality and latency — if you watch video or play games, look for a low-latency mode and read what owners report. Third the practical side: how many full charges the case holds, whether the hooks must sit in the case to charge, whether the case charges over USB-C, and how much the hooks and battery add behind your ear over a long session. Also check whether the module has a microphone and how it is rated for calls. 2453 sold with a 95.8% positive rating.

Consumer Electronics

Earphone Upgrade Cable Fitment Guide: MMCX vs 0.78mm 2-Pin vs QDC vs Dual 3.5mm, Plus 3.5/4.4mm Plug Choice

Replacing the stock cable is the cheapest real upgrade in portable audio, but it is also where most people buy the wrong thing — the connector on your in-ear and the plug on your player both have to match. This cable is offered in MMCX, 0.78 mm 2-pin, QDC and Dual 3.5 mm variants, and with either a 3.5 mm single-ended or a 4.4 mm balanced plug, which means four connector types times two terminations. Before ordering, do three checks: first, identify your IEM side — MMCX is a screw-on round plug, 0.78 mm 2-pin is the flat two-pin push fit, QDC is recessed, and Dual 3.5 mm uses two small plugs; second, confirm what your source actually outputs, because a 4.4 mm balanced plug will not fit a 3.5 mm socket and adapters can defeat the point; third, decide on the length and whether you want a microphone or not. The listing references HIFIMAN, Truthear ZERO:RED and AFUL Performer models as usage examples, so confirm your exact model with the seller if you are unsure.