Sennheiser SPORT True Wireless review

Sennheiser’s SPORT True Wireless is an earlier, fully untethered in-ear model, identified on its U.S. product page as article 509299. The manufacturer marks it end of life on that site. This research-based assessment follows the maker’s product record, regional specification page and exact-model manual; it is not a listening, fit, workout, water or battery test.

Open adapters do not make this an open-ear design

Sennheiser describes this pair as true-wireless stereo earbuds with ear-canal coupling. The unusual part is the acoustic-adapter choice: blue-marked open adapters go with Aware mode, while closed adapters go with Focus mode. Both still mount on an in-ear sound tunnel and enter the ear canal. So this belongs with sealed in-ear products in the finder, not with cuffs, hooks or buds that sit outside an unsealed canal.

The setup demands that the physical adapter and app setting agree. The manual says mismatching them can leave the buds usable but make the sound—especially bass—suboptimal. Aware is an acoustic setup intended to make certain environmental sounds easier to hear; Focus uses the closed adapters to reduce awareness and increase immersion. Neither is an active noise-cancellation mode. Sennheiser’s specification explicitly lists active noise cancellation as false, so do not treat “Focus,” passive fit isolation or the product name as ANC.

There are several fit pieces to account for

The manual’s original package list includes open and closed silicone adapters in S, M and L, plus ear-fin sizes N, S1, S2 and S3; the N fin is the no-fin option. The manual recommends a snug canal insertion and explains how to orient the fins. That is a useful range to try for a workout-oriented fit, but a size list is not evidence that a particular ear will seal comfortably or stay put through a specific activity. On an earlier listing, confirm the exact pieces actually present rather than assuming the original box is intact.

There is also a practical setup dependency: Sennheiser describes its Smart Control app as the place to configure the acoustic modes and equalizer. Current manufacturer app guidance lists SPORT True Wireless among supported products, but compatibility is not a promise that a specific older phone, operating-system version or seller’s unit will pair smoothly. Check your host and app before relying on an app-selected mode.

IP54 applies to the earbuds, not the case

The exact model manual states IP54 for the earbuds and says they can be used in rain or sandy, dusty conditions, but not immersed or worn in the shower. It also says the charging case is not splash-proof and should stay dry. Wet earbuds must be dried completely before charging. That is why the model fits the finder’s earbuds-only IPX4-level splash choice—the water digit is 4, with a separate dust claim—not its IP57 earbuds-and-case choice.

The components remain separate: the buds have a published rating; the case does not. The manual’s care directions still matter after sweat or rain. Do not interpret an IP code as permission for swimming, showering, or placing wet buds in a powered case.

Read the battery figure as a test condition, not a promise

Sennheiser advertises up to nine hours of playback and up to 27 hours with the charging case. The manual’s nine-hour example specifies an iPhone within one meter, AAC, mixed music, 50 percent volume and no EQ. That is a manufacturer test condition, not a measurement here and not a forecast for an aged battery. The model has no documented ANC-on runtime because its specifications say it has no ANC at all. A request for even one hour of ANC listening therefore does not fit this model.

The case charges over USB-C, but the sources checked do not establish whether it also supports wireless charging. Do not infer “wired-only” from the port alone or assume a Qi pad will work. If comparing an older unit, ask for a current charge-and-play demonstration and return terms; neither the original maximum nor an old product photograph can establish its present battery capacity.

Codec support is not device compatibility

The manufacturer lists Bluetooth 5.2 and SBC, AAC and aptX support. Those codec labels describe supported Bluetooth audio paths, not guaranteed host negotiation or a universal sound-quality ranking. A phone or computer needs compatible software and a route that actually selects the same codec. The available manual explains selecting among paired devices in the app but does not establish two simultaneous source-device connections. Remembered pairing, a source-selection screen and multipoint are different claims; this review does not recommend the model for a two-device-at-once requirement.

Keep it separate from similarly named Sennheisers

This SPORT True Wireless article 509299 is not CX SPORT article 508256, an earlier cable-connected neckband with a different manual and no charging case. It is also not the later MOMENTUM Sport: that separate model adds documented fitness sensors, ANC and a Qi-capable case. Those products have their own assessments because names that share “Sport” do not establish shared features or accessories.

Who should consider this earlier model?

It is a source-supported possibility for someone who wants true-wireless earbuds with interchangeable open/closed in-canal adapters, several stabilizing-fin choices, USB-C case charging and an IP54 rating limited to the earbuds. It is a poor fit for a shopper requiring ANC, ANC-on hours, confirmed wireless case charging, an IP-rated case or proven simultaneous two-host operation. The open adapter may change awareness and body-borne noise, but it does not turn the design into an unsealed open-ear earbud.

Sennheiser’s end-of-life label describes its own U.S. web store, not every seller’s inventory. The original manual’s package list is a checklist, not proof that a resale unit includes its case, both adapter sets, fins, cable or documentation. Confirm article 509299, the exact parts and charging path, the unit’s battery and pairing behavior, seller condition, warranty and return terms. This review assesses documented capabilities; it does not verify a current offer or the state of any individual unit.