Fashionable appearance design: the surface is painted, the surface is smooth and clean; the arm may be 460mm in the rising position; Operate without authorization or try to lower the arm's external force to sound an alarm; Waterproof: the parking barrier is well immersed in the water; Anti-theft: install bolts inside to make it impossible; Compression resistance: The shell is made of 3mm steel and is strong. Power status indicator: When the current is less than 4.5V, there will be an alarm sound.