Research-based buying guide: We have not independently tested this product. Specifications below are attributed to the linked manufacturer information.

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The 2891-20 is Milwaukee’s M18/M12 wireless jobsite speaker. Before buying it, distinguish the power options and operating requirements from the claims made for other Milwaukee audio products.

Battery platforms and AC power

Milwaukee lists M18 and M12 battery compatibility as well as AC operation, and identifies an AC adapter in the package. Confirm the seller’s contents and which batteries or charger, if any, are supplied. Do not assume that battery operation means the speaker also charges those batteries.

The waterproof claim has been withdrawn

The prior title and specifications described this speaker as waterproof and IPX6. Those claims were not substantiated by the linked model documents. The 2891-20 manual instructs against use near water and immersion. Follow the applicable manual; a jobsite label is not permission to expose electronics to rain or liquid.

Compare audio features without invented test results

Consider source connections, placement, available space and battery compatibility. Manufacturer descriptions of sound or wireless range are not results from our own listening or range tests. We have removed a claimed 12-hour runtime, 360-degree audio claim and an unsupported average rating from 500 purchasers.

Purchase checks

Match model 2891-20, inspect used units and confirm regional AC requirements and current support. We have not measured loudness, clarity, wireless reliability, impact resistance or runtime. Do not choose worksite volume in a way that masks required alarms or communication.