The best way to ensure that you're playing safe.
Handy size: 5 3/8 x 2 3/4 x 1 1/4 inches Weighs under 7 ounces with battery installed No tools necessary to change the battery Low battery indicator One button operation Full 3-digit LCD display Reads 4 to 30 bps (balls per second) Reads 200 to 399 fps (feet per second) Uses one 9 volt battery