Better than wired. But buy 2.
You'll need two if you want to ensure you always have one charged or charging. To use, first you long press the power button until you get a solid blue light. There are two modes. Once you press the button again it will heat for 15 min. Another press and it will be 10 min. The blue LED will be blinking at slightly different speed depending on the mode. The build quality is pretty high. I'm not sure what the Joeb guy is complaining about. This is the best build quality warmer on the market. All aluminum and waterproof. Wired warmers have risk of the cables tearing when accidentally stretched, so these are far more durable. The only downside is the battery life and charging speed, which is why I recommend at least 2.
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