The shape of the LA-15P and LA-15PB allows the cabinets to lock together in a trapezoid formation or allows the system to be used in a horizontal position as a floor monitor.
Because lock tongue ACTS on wheel tooth from horizontal direction in the utility model, its force has little influence on horizontal rotary disc.
本实用新型由于锁舌从水平方向作用于轮齿，其作用力对水平的回转盘影响较小。
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The shape of the LA-15 allows the cabinets to lock together in a trapezoid formation or allows the system to be used in a horizontal position as a floor monitor.