Amazon calculates a product's star ratings based on a machine learned model instead of a raw data average. The model takes into account factors including the age of a rating, whether the ratings are from verified purchasers and factors that establish reviewer trustworthiness.
The product is good overall. The glass breaking hammer is quite sharp with a good cover. I am sure it can easily break a car window in an emergency without application of much force. The blade for cutting the seat belt is recessed and quite sharp. Since the blade is not open, cutting with it is not very easy and may require some practice. The sticking tape is frankly of no use since it is too small to hold the hammer when stuck in the car.
Can't tell if the blade is sharp enough to cut the belt fast in case of emergency. Also the velcro is not big enough to hold the item on the side rail if the vehicle. It keeps dropping so hard to place it in the glove compartment. Overall the item looks sturdy and of good quality.