How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want to turn an older car stereo or a home speaker system into a wireless one — with hands-free calling and voice assistant access — choose XTREME Monster; if you need a durable 10-foot replacement cable to connect Bose or JBL headphones to a phone, laptop or MP3 player, choose Elecan 135.
These two products share the word "audio" and a 3.5 mm plug, and that's about where the similarity ends. One is a Bluetooth receiver. The other is a passive analog cable. Comparing them head-to-head only makes sense if you're a shopper who landed on both listings while trying to figure out what your setup actually needs. That's the buyer I'm writing for.
• XTREME Monster — biggest strength: Adds Bluetooth streaming, hands-free calling and Siri/Google Assistant access to any stereo or speaker with a 3.5 mm AUX input, and can run either on its rechargeable battery or plugged in for continuous power.
• XTREME Monster — biggest trade-off: It's a wireless bridge, not a sound upgrade. It doesn't replace a broken headphone cable, and it needs charging (or a cable) plus a paired phone to do anything at all.
• Elecan 135 — biggest strength: A 10-foot, tangle-resistant nylon-braided 3.5 mm to 2.5 mm cable with a 135-degree elbow, built for headphones whose stock cable is too short, too stiff or already dead.
• Elecan 135 — biggest trade-off: It's a cable. No Bluetooth, no microphone, no voice assistant. It only works if both devices have the right jacks and the 2.5 mm end matches your headphones.
• Who each pick is for: XTREME Monster → drivers and home listeners who want wireless audio from wired gear. Elecan 135 → Bose QC/700, JBL E-series and similar headphone owners who need a long, flexible replacement cord.
The XTREME Monster (model WBA9) is a Bluetooth audio receiver in a black plastic body. It's designed around one idea: your car stereo or home speaker already sounds fine, it just isn't wireless. Plug the receiver into a 3.5 mm AUX input, pair your phone, and you're streaming to equipment that was never built for Bluetooth. That's the whole pitch, and it's a good one for anyone with an older head unit, a kitchen radio, a bookshelf system or a set of powered speakers.
The multi-function button is where the design earns its keep. One button handles answer, end and redial for calls, and it also wakes Siri or Google Assistant. The built-in microphone means you can take a call through the car's speakers instead of fumbling with a phone on your lap. The spec sheet also notes support for navigation apps, so turn-by-turn audio routes through the vehicle's speakers — genuinely useful if your car's built-in system predates smartphone integration. Output is stereo over the AUX connection, and it handles standard audio formats.
Power is the other thing XTREME got right for real-world use. The unit is battery powered, so you can unplug it and carry it from car to kitchen to hotel room, but it can also run on continuous power while plugged in. That dual-mode design is the difference between a gadget you use twice and one that lives in your console. There's a 1-year manufacturer warranty, and setup is described as straightforward — pair, plug, play.
Who should buy it: anyone whose car or home stereo has an AUX jack and no Bluetooth. Commuters who take calls on the road. People who want one small receiver that moves between a vehicle and a house full of wired speakers.
Who should skip it: if your headphones have a broken or too-short cable, this does nothing for you. If you want better sound quality than your current setup, a Bluetooth receiver won't deliver it — it transmits, it doesn't improve. And if you'd rather not deal with pairing or charging at all, a plain cable is the simpler answer.
The Elecan 135 is a 10-foot audio cable, 3.5 mm male to 2.5 mm male, with a 135-degree angled connector on one end and a straight connector on the other. If that 2.5 mm figure looks odd, that's the point: it's the smaller plug size used by a long list of Bose and JBL headphones, including Bose On-Ear 2, OE2, OE2i, QuietComfort QC25, QC35, QC35 II, QC45, 700, SoundLink and SoundTrue, plus JBL E45BT, E55BT and E65BTNC. The 3.5 mm end goes into Samsung Android phones, MP3 players, tablets and laptops.
The design is clearly aimed at the failure point of stock headphone cables. The 135-degree elbow lets the plug sit flush in tight spaces and takes bending stress off the joint, which is where most cables die. The outer diameter is just 3.5 mm — noticeably thinner than typical aux cords — so it threads through narrow openings and coils without fighting back. The stepped connector is shaped to seat properly even through a thicker phone case, so you don't have to peel the case off every time you want to plug in. The jacket is nylon braided over a zinc alloy shell, and the conductor is pure copper with 24K gold-plated connectors.
Elecan's own claims are specific enough to be worth noting: the cable is rated for 15,000+ plug-in and plug-out cycles and tested through 10,000+ bending cycles, and the company says the construction avoids buzzing or noise during long, heavy use. It carries a 2-year warranty covering refund or replacement for quality issues. Weight is listed at 0.07 kg — light enough that it won't drag on your ears.
Who should buy it: Bose or JBL headphone owners whose original cable is lost, frayed or too short. Anyone who wants to use noise-cancelling headphones wired on a flight, at a desk, or anywhere Bluetooth isn't allowed or reliable. People who plug and unplug constantly and are tired of replacing cheap cords.
Who should skip it: if your headphones use a standard 3.5 mm jack on both ends, this is the wrong cable. If you want wireless freedom, this is the opposite of that. And if you only need a short cable for pocket use, 10 feet is more length than you want.
• Best for making an old car stereo wireless → XTREME Monster. It pairs with your phone and streams through the existing AUX input.
• Best for hands-free calls while driving → XTREME Monster. The built-in mic and one-button answer/end/redial are the core of its design.
• Best for voice assistant and navigation audio → XTREME Monster. It links to Siri and Google Assistant and routes nav instructions through your speakers.
• Best for replacing a dead Bose or JBL headphone cable → Elecan 135. That 2.5 mm plug is exactly what those headphones take.
• Best for reach and flexibility → Elecan 135. Ten feet of thin, braided cable beats any stock cord for couch, desk or studio use.
• Best for durability under constant plugging → Elecan 135. The rated 15,000+ insertion cycles and reinforced elbow are built for that abuse.
• Best for portability between rooms → XTREME Monster. Rechargeable battery mode means it travels with you; a cable doesn't need power at all, which is its own kind of portability.
• Best for zero-setup simplicity → Elecan 135. No pairing, no charging, no app, no battery to think about.
If I had to pick one for myself, it would depend entirely on the problem in front of me, but if you forced a single answer: I'd buy the Elecan 135 for headphone duty and the XTREME Monster for the car. The Elecan is the lower-risk purchase — a well-specified cable that solves a concrete, common failure and is backed by a 2-year warranty. The XTREME Monster is the more interesting product, and in my opinion it's the better buy for anyone whose actual goal is wireless audio in a car or a wired home stereo, especially with its rechargeable-or-plugged-in flexibility. Check the current price on Amazon for both before you commit, and match the product to your jack, not the other way around.
FAQ
Yes, per the compatibility list. The 2.5 mm end fits Bose QC25, QC35, QC35 II, QC45, 700 and several other Bose models, as well as JBL E45BT, E55BT and E65BTNC. Check your headphone's jack size before ordering, since not every headphone uses 2.5 mm.
It works with anything that has a 3.5 mm AUX input, including car stereos, home receivers and powered speakers. If a device has no AUX jack, this receiver has nothing to plug into.
They're not competing for the same job, so value depends on your need. In my opinion the Elecan 135 is the safer buy if you're replacing a headphone cable, while the XTREME Monster justifies itself if you genuinely want wireless audio and hands-free calls from wired gear. Compare current prices on Amazon before deciding.
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