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We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
If you want a Bluetooth transmitter that turns your TV's optical or AUX output into a private listening station for two people, choose Avantree Audikast 3; if you need a helmet-mounted wireless headset with a charging case for riding or skiing, choose OBEST Motorcycle. These two devices share almost nothing except the Bluetooth logo. One sits next to your TV and never moves. The other goes on your head. Getting this wrong means buying a product that simply cannot do the job you had in mind.
• Avantree Audikast 3 — biggest strength: It connects two Bluetooth headphones to one TV at the same time, with aptX-Adaptive support and a wireless range up to 100ft / 30m.
• Avantree Audikast 3 — biggest trade-off: It only works with TVs that have Optical (TOSLINK) or 3.5mm AUX audio output. HDMI-only TVs are out, and Optical audio must be set to PCM.
• OBEST Motorcycle — biggest strength: A true-wireless helmet headset with a 1900mAh charging case, roughly 5.5 hours of talk time per charge and up to 50 hours of standby.
• OBEST Motorcycle — biggest trade-off: It is designed for helmets, not living rooms. It has no optical or AUX input, so it cannot feed TV audio to anything.
• Who Avantree Audikast 3 is for: Anyone who wants to watch TV late at night without disturbing the house, or share a show with a partner using two sets of headphones.
• Who OBEST Motorcycle is for: Riders and skiers who want music, calls and GPS prompts inside a helmet without a wire running to a phone.
The Avantree Audikast 3 is a single-purpose device, and that is its appeal. It takes audio from a TV's Optical (TOSLINK) or 3.5mm AUX port and sends it wirelessly to Bluetooth headphones or speakers. That is the whole job, and the design is built around doing it well. Bluetooth 5.3 and aptX-Adaptive support mean compatible headphones get high-quality audio with reduced delay — the kind of lip-sync accuracy that matters when you are watching dialogue-heavy TV rather than just listening to music.
Buy it if your TV has an Optical or AUX output and you want private or shared listening without running a long cable across the room. Skip it if your TV only outputs audio over HDMI ARC/eARC — this transmitter cannot read that signal, and no adapter dance changes the fundamental limitation. Also skip it if you were hoping to use it as a portable headset; it is a corded, mains-powered stationary unit, not something you wear.
OBEST Motorcycle: Who It's For
The OBEST Motorcycle is a different animal entirely. It is a true-wireless helmet headset built around two priorities: staying put inside a helmet, and lasting a long time on a charge. The speakers mount inside the helmet with Velcro, and because each earpiece is truly wireless, there is no wiring harness to route around the shell or worry about being too short. That is a real quality-of-life difference for anyone who has fought with a traditional wired helmet kit.
On battery, the numbers tell the story: a 1900mAh charging case, about 5.5 hours of continuous communication per full charge, and up to 50 hours of standby. OBEST notes the working time varies with usage, which is fair — wind, volume and call time all chew through power. Bluetooth 5.3 gives it fast pairing and strong anti-interference, with a 10-meter signal range, so the connection should hold up while you ride or ski rather than stuttering every time you turn your head.
Side-by-Side: Which Should You Choose?
• Best for watching TV without disturbing others → Avantree Audikast 3. It exists purely to send TV audio to headphones.
• Best for two people watching one screen → Avantree Audikast 3. Two Bluetooth headphones connect simultaneously.
• Best for battery life → OBEST Motorcycle. A 1900mAh charging case, roughly 5.5 hours per charge and up to 50 hours standby.
• Best for hands-free use on the move → OBEST Motorcycle. True-wireless earpieces, a 10m range and a large control button built for gloves.
• Best for fixed-position, plug-in simplicity → Avantree Audikast 3. It is corded, stays by the TV and needs no charging.
• Best for wind-noise-heavy environments → OBEST Motorcycle. Environmental noise cancellation is designed around exactly that.
• Best for TV volume control when your TV locks the remote → Avantree Audikast 3. The transmitter has its own volume buttons.
• Best value depends on your use case → these are not substitutes. If you need helmet audio, only the OBEST does the job; if you need TV audio to headphones, only the Avantree does.
If I had to pick one for the average household, I would buy the Avantree Audikast 3. In my opinion, it solves a problem most people actually have — late-night TV, a partner who is trying to sleep, or two people wanting to watch together at their own volumes — and it does it with a straightforward optical or AUX connection and aptX-Adaptive audio. That said, I would only recommend it if you have confirmed your TV has an Optical or AUX port. If your real need is music and calls inside a helmet while riding or skiing, the OBEST Motorcycle is the obvious choice and the Avantree is irrelevant to you. Match the device to the job, and neither will disappoint.
The Avantree Audikast 3, clearly. It is engineered to take Optical or AUX audio from a TV and send it to Bluetooth headphones. The OBEST Motorcycle has no TV audio input at all, so it cannot do this job.
No. It only supports Optical (TOSLINK) or 3.5mm AUX outputs, and HDMI ARC/eARC-only TVs are not compatible. Check your TV's ports before buying, and if you use Optical, set the TV audio output to PCM.
A fully charged set of earpieces gives roughly 5.5 hours of continuous communication, with up to 50 hours of standby, and the 1900mAh charging case tops them up on the go. Actual working time varies with usage, volume and conditions.
They do different jobs, so if both matter to you, they are not interchangeable. Buy the OBEST Motorcycle for helmet audio and the Avantree Audikast 3 for TV listening. Neither replaces the other. Check the current price on Amazon for each before deciding.
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