Features: 1.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. 2.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. 3.Plastic material: light and compact, easy to carry, zero sense of wear. 4.Simple design: simple and easy to use. 5.Intimate design: When the product issues an alarm, only the wearer can hear it and it will not affect others. Specification: Description: _x000D_ Are you still worry about feel sleepy when driving, on duting, standing guard, writing and sitting in an upright position? This product is designed to remind the change of head tilt range when wearing, when the head tilt range exceeds the safe range will sound an alarm sound, effectively prevent drowsiness. _x000D_ _x000D_ Features: _x000D_ 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. _x000D_ 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. _x000D_ Plastic material: light and compact, easy to carry, zero sense of wear. _x000D_ Simple design: simple and easy to use. _x000D_ Intimate design: When the product issues an alarm, only the wearer can hear it and it will not affect others. _x000D_ _x000D_ _x000D_ Specifications: _x000D_ Material: Plastic _x000D_ Colour: Black _x000D_ Weight: 14g _x000D_ Battery Specifications: Ag3X4 _x000D_ Product Specifications: 6 * 5.5cm / 2.3 * 2.1in _x000D_ Packing Specification: 16 * 9cm / 6.6In _x000D_ Issue Alarm Angle: 15-25 _x000D_ Alarm Mode: Sound Alarm Mode _x000D_ _x000D_ Packing List: _x000D_ 1 * Sleep Alarm _x000D_ _x000D_ _x000D_ Note:_x000D_ Avoid high temperature and humidity storage