If you want helmet-mounted rider communication and smartphone access for streaming, choose Sena pi; if you need waterproof open-ear headphones with offline playback, choose mojawa Purra Swim Bone. The key difference is how you listen: Sena is built around cycling and multi-sport helmet use, while mojawa adds onboard MP3 playback for swimming and other workouts.
If you want helmet-mounted rider communication and smartphone access for streaming, choose Sena pi; if you need waterproof open-ear headphones with offline playback, choose mojawa Purra Swim Bone. The key difference is how you listen: Sena is built around cycling and multi-sport helmet use, while mojawa adds onboard MP3 playback for swimming and other workouts.
For streaming, Sena pi is the more straightforward fit when you want music from a paired phone alongside GPS navigation, calls, and intercom functions. mojawa Purra Swim Bone is more versatile across wet and dry activities, but its Bluetooth mode is not the mode to rely on underwater; its built-in storage is the practical swimming option.
Sena pi vs mojawa Purra Swim Bone at a Glance
• Sena pi’s biggest strength: helmet-strap mounting and intercom support for up to two riders within 400 meters in open terrain. Trade-off: it is a helmet headset, not an underwater listening option.
• mojawa Purra Swim Bone’s biggest strength: IP68 waterproofing plus 32GB of built-in storage for offline MP3 playback. Trade-off: underwater listening calls for MP3 mode rather than Bluetooth streaming.
• Sena pi battery: up to 6 hours of talk time, with a 2.5-hour charge time.
• mojawa battery: up to 15 hours of playback at moderate volume, with a 1-hour charge time.
• Choose Sena pi for helmet-based cycling communication and phone-connected audio.
• Choose mojawa for swimming, offline music, and open-ear use across workouts.
How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-22 · 6 min read · Independent comparison
Sena pi is designed to clip onto the straps of most cycling and multi-sport helmets. Its core appeal is combining helmet use with Bluetooth intercom: it can connect up to two riders within an effective range of 400 meters in open terrain. That makes it a more purpose-built choice for riders who want to communicate while moving, rather than simply wear general-purpose headphones.
Pair it with a smartphone and you can access music, hear GPS navigation, and make or take phone calls. For streaming, that phone connection is the main route: your audio comes from the paired device, while the headset also serves the cycling-oriented use case. The Sena Utility App adds functionality such as QR-code-based Smart Intercom Pairing with other Sena Bluetooth devices.
I’d choose Sena pi if helmet attachment and rider-to-rider communication matter more than water resistance or long playback time. I’d skip it if you want headphones for swimming, standalone music storage, or a listed battery life longer than six hours. It is an on-ear helmet headset, not an all-purpose swim headphone.
mojawa Purra Swim Bone is an open-ear, bone-conduction-style option aimed at swimming and other active use. Its IP68 waterproof rating is the defining distinction here: the product information describes it for underwater use as well as rain, showers, and sweaty workouts. If you want IPX7 waterproof true wireless earbuds for streaming, note that this is a different design category: Purra is an open-ear headphone with an IP68 rating, not a true wireless earbud.
Its 32GB of built-in storage lets you load music and switch to MP3 mode when Bluetooth is unavailable underwater. For ordinary phone-connected listening and calls, it also supports Bluetooth. That makes it useful for a routine that moves from pool sessions to running, cycling, or gym workouts without requiring the same listening mode everywhere. It supports connection to two devices at once, and the listed playback time is up to 15 hours at moderate volume.
I’d lean toward mojawa if you want one device for swimming and dry-land exercise, or if carrying a phone is inconvenient during a workout. I’d skip it if helmet intercom communication is the priority, or if your main goal is Bluetooth streaming while underwater. Its swimming advantage comes from local MP3 playback, not a promise that Bluetooth streaming works beneath the surface.
Side-by-Side: Which Should You Choose?
• Best for swimming → mojawa Purra Swim Bone. Its IP68 waterproof rating and offline MP3 mode suit listening when Bluetooth is unavailable underwater.
• Best for streaming from a paired phone during cycling → Sena pi. It can access phone music, GPS navigation, and calls while serving as a helmet-mounted headset.
• Best for longer listed playback time → mojawa. It specifies up to 15 hours at moderate volume, compared with Sena’s six hours of talk time.
• Best for a quick recharge → mojawa. Its listed full charge time is one hour, versus 2.5 hours for Sena pi.
• Best for using stored music without carrying a phone → mojawa. Its 32GB onboard storage supports MP3 mode and several audio formats.
• Best for quick pairing with other Sena devices → Sena pi. The Sena Utility App includes Smart Intercom Pairing using a QR code.
• Best for an open-ear fit across varied workouts → mojawa. Its design is open-ear, with a flexible titanium alloy frame and silicone materials; Sena is described as an on-ear headset that clips to helmet straps.
I’d choose mojawa Purra Swim Bone if I wanted one pair for pool sessions and varied workouts, because IP68 waterproofing, onboard storage, and the longer listed playback time address more situations. For streaming, it works well as a phone-connected option on dry land, while MP3 mode is the practical choice underwater. I’d choose Sena pi instead if helmet mounting and rider communication are the deciding needs.
FAQ
Sena pi is the more directly cycling-focused option: it clips to helmet straps and can access smartphone music, navigation, and calls. mojawa also supports Bluetooth phone connections, but its standout features are waterproofing and offline playback.
mojawa lists up to 15 hours of playback at moderate volume and a one-hour full charge. Sena pi lists six hours of talk time and a 2.5-hour charge time; those figures describe different usage measures, so they are not a direct test-to-test comparison.
No. Sena pi is an on-ear Bluetooth headset designed to attach to helmet straps and support rider intercom. mojawa is an open-ear headphone with IP68 waterproofing, Bluetooth, and built-in MP3 storage.
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