TL;DR: This open-box Ember Mug 2 keeps coffee or tea at your exact chosen temperature on its charging coaster, on sale for $69.99 (MSRP $129.95).

There’s a small window when coffee is perfect. Too hot and you’re waiting. Too cold and you’re disappointed. The Ember Mug 2 is on sale for $69.99 and makes that window last as long as you want — up to 90 minutes on its own or all day with the included charging coaster.

Set your preferred drinking temperature between 120°F and 145°F, and the mug holds it there. Out of the box, it’s preset to 135°F, so you can start sipping right away. For more control, pair it with the Ember app on iOS or Android to customize presets for different drinks, change the LED color, and get a ping when your coffee or tea hits that sweet spot.

The 10‑ounce mug is built from ceramic‑coated stainless steel with a scratch‑resistant finish and is IPX7-rated, meaning it’s safe for hand washing and can be submerged in water up to 1 meter. The built‑in battery recharges on the USB‑C powered coaster, so you can keep it at your desk and never worry about your drink going cold halfway through a meeting.

It also features auto sleep, shutting itself down when not in use and waking back up when you pick it up or pour in liquid. A smart LED lets you know what’s happening at a glance — heating, ready, or on standby.

This unit is an open-box item, which means it may have retail stickers or minor handling marks on the packaging, but the mug itself has been verified to be in like‑new condition. It comes with a one‑year warranty.

If you want your coffee, tea, or hot cocoa to taste like it’s fresh‑poured every time you take a sip, this might be the easiest upgrade you make all year.

Check out this open-box Ember Mug 2 Temperature Control Smart Mug in black for 46% off of $129.95, available for $69.99.

StackSocial prices subject to change.