A good assistant: Most traffic accidents are caused by fatigue driving. Life is only once. This product will alert you when it is a little sleepy, It can can effectively prevent traffic accidents. Wide applicability: It is suitable for a wide range of people, such as night shifts, door guards, guards, television stations, radio stations, night broadcasts of check-in personnel, medical and security personnel. Plastic material: Light and compact, easy to carry, zero sense of wear. Simple design: Simple and easy to use. Intimate design: When the product issues an alarm, only the wearer can hear it and it will not affect others. Specifications: Material: Plastic Colour: Black Weight: 14g Battery Specifications: Ag3X4 Product Specifications: 6 5.5cm / 2.3 2.1in Packing Specification: 16 * 9cm / 6.6In Issue Alarm Angle: 15°-25° Alarm Mode: Sound Alarm Mode