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The Mainstays 12 oz Warming Coffee Mug is a stainless steel mug with a built-in rechargeable battery and three heat settings. Off the coaster it keeps a drink warm for up to 2 hours; on the included charging coaster it holds heat for longer sessions at a desk or table. LED lights show the heat level at a glance, and a lid and power adapter come in the box. It suits people who sip slowly at a desk and want a self-heating mug without paying premium smart-mug prices, though its 12 oz capacity and fixed heat levels are simpler than app-controlled rivals.
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Ratings are strong overall, and owners mostly like the convenience of a mug that keeps drinks warm through a long morning. Complaints center on the small capacity and the battery running down during longer sessions.
This 12 oz stainless steel mug keeps coffee, tea or hot chocolate warm. It has three heat settings, so you can choose the level that suits your drink. LED indicator lights show the mug's temperature at a glance.
The mug has a built-in rechargeable battery and warms beverages for up to 2 hours on its own. When it sits on the charging coaster, it keeps heating for longer. The set includes a lid and a power adapter.
