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. 2017 Aug 17;7:8596. doi: 10.1038/s41598-017-08674-8

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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A photograph of the handheld battery-powered heating device. The main components of the handheld battery-powered heating device are a process-controlling module and a metal heater module. There are vents and charging port on the back of the device and a heat insulation layer on the top of the device.