Including fingerprint recognition attendance machine, vein recognition, iris recognition attendance machine, face recognition attendance machine and so on. The fingerprint identification attendance machine entered the market for 3-4 years, with less mass production and more test models. The retail price ranged from 600-20000 yuan for fingerprint attendance machines to tens of thousands of iris attendance machines. The main advantage is that there is no need to carry a card, which can eliminate the punch card and no card loss. The disadvantage is that when the fingerprint attendance machine is used by more than a few hundred people, the processing time is several times slower than other punching methods. At the same time, in the static interference, sweat salt, other stolen goods, finger wear, close angle or pressure is not good, the collection head is difficult to read the fingerprint, the light identification is low, and the heavy identification fails. The iris attendance machine is limited by hardware miniaturization and price, and its main use is still limited to special areas such as access control, bank vaults, and safes in important areas. At present, the most popular one is undoubtedly the face recognition attendance machine, the intelligent face recognition attendance machine, which has been seen everywhere in the domestic high-end office buildings, once again triggering the change of the attendance era, because of its unique characteristics, it is known as the world, the price It is much cheaper than the iris recognition system, so it is favored by the enterprise. It is irreplaceable and unrepeatable. It shows a proud attitude and has a tendency to replace the noble iris and fingerprint. The face recognition attendance machine works: it is a biometric technology based on human facial feature information for identification. First, use a camera or camera to capture images or video streams containing faces, and automatically detect and track faces in the images, and then perform a series of related techniques on the faces of the detected faces, including face image acquisition, face Positioning, face recognition preprocessing, memory storage and comparison identification, to achieve the purpose of identifying different people. Face recognition attendance system combines face recognition and attendance system, and through face recognition as one of the elements of attendance management. Grass Ttrimmer is an kind of garden tool for the maintenance of lawns under shrubs and bushes,along walls and in other inaccessible places.The cutting implement is usually a quickly rotating nylon cord which can be adjusted in length when worn. String Trimmers,Grass Trimmers,Brush Cutters,Small Grass Trimmers AWLOP CO.,LTD , https://www.awlop.com