The present invention relates to a light-emitting device, and more particularly, to a light-emitting device that can emit light using a portable battery and warns through vibration or flashing when the remaining amount of the battery is insufficient. In the light emitting device provided to be detachably attached to the hard hat, the light emitting device according to the present invention comprises: an annular frame surrounding the hard hat; A plurality of light emitting units along the outer peripheral surface of the frame; A portable battery that supplies power to the light emitting unit; And a vibration motor generating vibration when the remaining amount of the battery is less than a set amount.
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