If you want replacement tips that focus on a secure, comfortable fit for sleeping, choose AZLA SednaEarfit Crystal; if you need complete wireless earbuds with their own drivers and charging case, choose Generic Air31. AZLA is the more relevant option for changing the fit of compatible earbuds, while Air31 is a standalone listening device. The difference is fundamental: one is a set of ear tips, and the other is a pair of Bluetooth earphones.
AZLA SednaEarfit Crystal vs Generic Air31 at a Glance
• Generic Air31: It includes wireless earbuds, a microphone, controls, and a charging case; its trade-off is that the stated single-charge playtime is up to five hours, and fit depends on finding a suitable tip size.
• Choose AZLA if you already own compatible earbuds and want to adjust their fit or passive sound isolation.
• Choose Air31 if you need a complete wireless earphone setup for music, calls, and activity.
AZLA SednaEarfit Crystal is for someone who already has compatible wireless earbuds and wants to change the way they sit in the ear. Its German LSR silicone is described as hypoallergenic, and the naturally grippy surface is intended to help the tips stay in place during everyday movement. Multiple sizes give buyers options for different ear shapes rather than relying on one standard fit.
That fit-focused design may matter during long listening sessions, including winding down at home or listening while trying to sleep. The tips are intended to form an acoustic seal that improves passive sound isolation without changing the earbuds' original sound signature. That is a useful distinction: these tips are not an audio upgrade with their own drivers or noise-canceling electronics. Their role is to improve the physical interface between compatible earbuds and the ear.
Compatibility is the key buying check. The product is described as compatible with many popular wireless earbuds, including Beats Powerbeats Pro and Powerbeats Pro 2, and the design information also identifies Galaxy Buds 2, Buds, and Buds+ as compatible. The listing says it is not compatible with Galaxy Buds Pro, Galaxy Buds Live, or AirPods Pro. Its ultra-short 4 mm core is meant to fit a wide range of true wireless earbuds, but that does not remove the need to verify the fit for a specific model.
Who should skip it: Skip AZLA if you need earbuds, Bluetooth, a microphone, or a charging case rather than replacement tips.
Generic Air31 is the more direct choice for someone who needs complete wireless earphones. It uses 6 mm dynamic drivers, connects over Bluetooth 5.3, and includes a microphone and earbud controls for music, calls, and voice-assistant access. The stated wireless range is up to 30 feet, which gives a practical outline of how far a connected device may be from the earbuds before the connection is beyond the listed range.
For workouts or active days, the Air31 listing specifies an IPX7 waterproof rating and describes the earbuds as able to handle sweat or a quick splash. Soft silicone tips come in multiple sizes, so users can try to find a snug seal. The product also describes active noise cancellation, though the available information does not explain its performance or how it affects listening in different settings. Buyers should treat the listed feature as a specification, not a guarantee of a particular noise-reduction experience.
How We Research
We compare products from their published specs and features; the verdicts below are our independent editorial opinions.
Updated: 2026-10-20 · 8 min read · Independent comparison
Who should skip it: Skip Air31 if you already own compatible earbuds and only want replacement tips to adjust their fit.
• Best for adjusting the fit of earbuds you already own: AZLA SednaEarfit Crystal. Its purpose is to replace tips, with multiple sizes and grippy silicone intended to help maintain a secure fit.
• Best for a complete wireless listening setup: Generic Air31. It includes Bluetooth earbuds, 6 mm dynamic drivers, a microphone, controls, and a charging case.
• Best for passive sound isolation through an ear-tip seal: AZLA. The design aims to improve the seal while preserving the original sound signature of compatible earbuds.
• Best for workout use based on stated moisture protection: Air31. Its IPX7 rating and sweat-oriented design are relevant for exercise, although the listing does not describe testing conditions.
• Best for matching different ear shapes: Both offer multiple tip sizes. AZLA is a replacement-tip option for compatible earbuds; Air31 includes soft silicone tips with its own earphones.
• Best for calls and voice-assistant access: Air31, which specifies a microphone and controls for calls, music, and voice-assistant use.
• Best for a multipoint headset for sleeping: Neither product sheet specifies multipoint connectivity. Air31 lists Bluetooth 5.3, but that alone does not establish multipoint pairing; AZLA is not a headset.
• Best touch control gaming headset for sleeping: Neither is identified as a touch-control gaming headset. Air31 lists button-based controls and describes gaming use, while AZLA is a set of tips rather than a headset.
• Best starting point when searching for the best open ear headphones for sleeping: Neither is open-ear by the information provided. AZLA is an in-ear tip set, and Air31 is described as in-ear.
• Best for charging between listening sessions: Air31, because its case is stated to provide four additional charges. AZLA has no battery or charging case of its own.
Start by deciding whether you need to change an existing earbud fit or buy a complete listening device. AZLA cannot play music on its own, connect to a phone, or handle calls. It only makes sense if you have compatible earbuds and want to replace their tips. Air31, by contrast, is a full wireless earphone set, so it makes more sense for someone who needs the earbuds, controls, and case together.
Next, confirm compatibility and fit. With AZLA, the short 4 mm core and broad compatibility language are not a substitute for checking whether your exact earbuds are listed as compatible. The sheet names several compatible models and also names models that do not fit. With Air31, the supplied multiple-size silicone tips give some flexibility, but the specifications do not state that every ear shape will find a secure or comfortable fit.
Finally, keep the Air31 battery claims in perspective. One section specifies up to five hours per charge and up to 20 hours with the case, while another gives an eight-hour single-charge figure. Since those claims do not agree, the five-hour specification is the more cautious basis for planning. The supplied information also does not establish multipoint support or touch controls, so do not assume either feature from Bluetooth 5.3 or the gaming wording.
My Verdict
I would choose AZLA SednaEarfit Crystal if I already owned compatible earbuds and my priority were a more secure, comfortable tip fit for sleeping. Its grippy, hypoallergenic silicone and multiple sizes give it a clear fit-focused purpose. I would choose Air31 instead when I needed complete wireless earbuds for calls, music, and exercise. For sleeping specifically, AZLA is my pick only as a replacement-tip option, not as a standalone headset.
No. AZLA SednaEarfit Crystal is a set of replacement tips for compatible earbuds. Generic Air31 is a complete pair of wireless in-ear earphones with drivers, Bluetooth, a microphone, controls, and a charging case.
Neither is described as a sleep-specific product. AZLA focuses on a comfortable, grippy tip and a passive acoustic seal, which may appeal to someone adapting compatible earbuds for quiet listening. Air31 is a complete in-ear set, but its listed features do not establish a sleep-oriented design.
The available specifications do not state multipoint pairing or touch controls. They specify Bluetooth 5.3 and an inline-style button control description for music, calls, and voice-assistant access, so those unstated features should not be assumed.
The key features state up to five hours per charge, with the case providing four additional charges for up to 20 hours of listening. Another description claims up to eight hours on a single charge, so the information conflicts; planning around the five-hour figure is more cautious.
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