Ember Mug Lid

This is a simple add-on to a great product. The Ember coffee mug keeps coffee at the perfect temperature. This lid serves two purposes:
1 - If you step away from you desk you can place this lid on your mug to keep heat in and save battery power
2 - After you clean your mug this can serve as a dust cover while the mug sits empty on your desk

https://ember.com/products/ember-mug-2