Size:4.5 x 4.6 x 3cm Weight: 29g Ni ce appearance and comfortable feel Compact design and portable Made of plastic Metal hoop is convenient for you to carry With zero clearing switch on the right side Mechanically jumps by every press, quick reaction Counts Range: 0000 to 9999 4-digit display C ounting speed: ≤ 300 number / s (based on the humans reaction speed)