Sennheiser MOMENTUM 5 Wireless and BTD 700 Set (Black) review

This assessment covers the Black U.S. MOMENTUM 5 Wireless and BTD 700 set, listed by Sennheiser as product 15501362233715, Black variant 63978634871155. The named components are the M5AEBT over-ear ANC headphones and a BTD 700 Bluetooth USB adapter (component SKU 700434); the set JSON publishes no separate bundle or headphone-component SKU. This is a source-based configuration review, not an in-person test. Comfort, sound quality, call performance, actual battery life and the noise any wearer hears are not measured here.

The reason to choose the set is a different source path

The regular MOMENTUM 5 already accepts audio over Bluetooth, through its 2.5 mm analog input, and over its own USB-C digital-audio connection. The BTD 700 adds a route in which compatible host audio enters by USB and reaches the headphones over Bluetooth. It can help when the host provides USB audio but its built-in Bluetooth is inconvenient or lacks a desired supported codec. The BTD 700 is not an analog adapter and does not use the M5's USB-C audio input.

Sennheiser confirms pairing the M5 with the BTD 700. The dongle connects by USB-C to a compatible mobile device or computer, or by USB-A to a PC/Mac using its adapter, and appears as an external sound card without driver installation. A hub must carry data and power. The set page names both components but does not itemize the full box, so confirm the exact offer's accessories.

Host compatibility is the critical check

The BTD 700 is intended for smartphones and PC/Mac, not a generic USB audio source. Its manual says it cannot be used with TV or hi-fi devices, and Sennheiser’s support answer says television USB ports are generally not class-compliant. A television with native Bluetooth is a different route and is not what this bundle’s dongle assessment covers. Before choosing the set for a work station, check that the specific host exposes USB audio over the port you plan to use. If you use USB-A, confirm you have the adapter and a PC/Mac host; do not treat every USB-A port as a compatible audio output.

Keep the transmitter’s feature list separate from the headset’s

The BTD 700 manual lists aptX, aptX Adaptive, aptX Lossless, SBC and LC3; M5 sources also list aptX Lossless and aptX Adaptive. That overlap does not guarantee a particular negotiated mode: the dongle manual makes codec and advanced-feature support dependent on the receiver. Its Unicast, Auracast and gaming functions are not established end to end for this M5 pair. No pair-specific latency or gaming test was performed.

ANC and the 57-hour rating belong to the M5’s own documentation

The M5 manual describes hybrid adaptive ANC with eight microphones; ANC can be active over Bluetooth when the battery has sufficient charge. Sennheiser rates direct Bluetooth music with ANC on up to 57 hours under an iPhone-at-mid-volume condition. No separate BTD 700 test is published, so do not treat 57 hours as a dongle-route guarantee. Volume, calls, settings, battery age and conditions affect actual runtime.

Direct M5 Bluetooth supports two simultaneous connections, but audio plays from one source at a time. Sennheiser does not confirm the same two-link behavior through the BTD 700, nor say that its 57-hour rating used active multipoint. If switching between a phone and computer is essential, rely on the documented direct M5 route rather than assuming a dongle connection adds another link.

Analog and USB-C remain separate alternatives

The M5 has a 2.5 mm analog input and its own USB-C digital-audio route. Analog ANC needs sufficient charge. Its instructions conflict on playback after battery depletion: the manual says to use the cable when the battery is empty, while the current FAQ says the M5 must be powered on and cannot operate passively. This assessment leaves passive use unresolved. The bundle page also omits an analog-cable inventory; verify the exact offer if that cable or passive fallback is essential.

Exact selectable finishes

The U.S. set record exposes Black, Denim, White, Bronze and Lavender as separate color variants, each with a distinct selected variant ID but no separate set SKU. The photos below are the exact manufacturer-selected finish images. Black, White and Bronze show the headphones with the BTD 700 and USB-A adapter; the Denim and Lavender selected images show the headphones only. Image content is illustrative of the selected finish, not a complete inventory of everything in the box.

Who should compare it with the regular M5?

Consider the set when its USB-to-Bluetooth route solves a real host problem, after checking the specific computer or mobile connection. If you do not need the dongle, compare the separately assessed Black MOMENTUM 5 Wireless; it is a different package. Neither assessment claims hands-on performance or certifies the set's full inventory, so verify seller, finish, accessories, return terms and host compatibility before ordering.