Feature 1A 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. 2Wide 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. 3Plastic material: light and compact, easy to carry, zero sense of wear. 4Simple design: simple and easy to use. 5Intimate design: When the product issues an alarm, only the wearer can hear it and it will not affect others. Description: 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. Features: 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 Packing List: 1 * Sleep Alarm Note: Avoid high temperature and humidity storage