Each one in a color box,16 pieces in a carton box.
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Introduction to Outdoor Sports

Outdoor sports is an emerging project group, covering mountaineering, rock climbing, mountain cross-country, river tracing, fixed-point crossing, forest exploration, desert exploration, cave exploration, etc. The most popular of which are mass mountaineering activities. From a technical point of view, most of these sports are challenging and adventurous sports related to mountaineering. In recent years, the Mountaineering Sports Management Center has organized many outdoor sports competitions, through this form to promote and publicize the benefits of this sport, sum up experience, standardize management, and better serve the masses.

Classification of Scorer
There are many types of counters, which are divided into two categories: synchronous counters and asynchronous counters according to the way that the clock terminals of the triggers in the counter are connected; according to the base of the counters, they are divided into binary counters, decimal counters and other arbitrary base counters; The change of the counting state in the process can be divided into an addition counter, a subtraction counter or a reversible counter. In addition, the counter also has functions such as preset number and programmable.
In practical applications, an integrated flip-flop can be used to form a counter by using the sequential circuit construction method; a medium-scale integrated counter can also be used to form a counter of any system according to the application needs. At present, whether the medium-scale integrated counter is of TTL structure or CMOS structure, the types and models are quite complete, and it is very convenient to use.