The most basic version: a room for $19 with no bed, toilet paper, towels, air-conditioning or "honor bar, " and only a single light bulb in the bathroom for safety.
Move a bar magnet near one or two coils to make a light bulb glow.
在一两枚硬币附近移动磁棒来让灯泡发光。
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LED bulb lamp can be used for advertising board background lighting, tunnel or bridge lighting, building structure decoration lighting, bar, house, entertainment place lighting, and so on!