A flashlight would likely work. So would an electric analog wristwatch.
闪光灯可能可以使用，类似的手表应该也可以。
Undark Nantong Electric co., Ltd. is a research and development, production, wholesale distribution of private limited company, LED rechargeable flashlight is ONDATA Nantong Electric co.
南通昂达电器有限公司是一家专业从事充电式LED系列照明产品研发、生产、销售的企业。
Undark Nantong Electric co., Ltd. is a research and development, production, wholesale distribution of private limited company, LED rechargeable flashlight is ONDATA Nantong Electric co.
南通昂达电器有限公司是一家专业从事充电式LED系列照明产品研发、生产、销售的企业。
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