box size

基本解释

Material selection, export structure design, and box size design are the key issues and difficulties of Fenzhouxiang millet packaging.
材料選擇、倒出口結搆設計、盒型尺寸設計是汾州香小米包裝的重點與難點。
Wrought iron or steel scrap 1.4 inch and over in thickness individual pieces not over 60 inches x 18 inches (charging box size) prepared in a manner to insure compact charging.
厚度達到或者超過1/4英寸的的熟鉄或廢鋼，單件不得超過60 英寸x 18 英寸（裝料箱尺寸），以保証緊密裝箱的方式準備好。
blog.sina.com.cn

As you can see above, the device is actually quite small, and most smartphones would have quite a bit of trouble fitting into a box that size.
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