Usage Tips:Game buzzers: you will receive 4 packs buzzer light buttons with light and sound, the shell color is black and red, side is blue with a big white "x" on top, increase lots of to the games and easy to use (recommended age: 12 ages and up) Funny game props: game buttons are Perfect for pranks, desk gadgets, home game at night, club revelry, gags and more; Also can be applied as party competition props for adults, and girls, the participants can be actively encouraged to participate in the competition by using quiz buzzers Make quizzes more interesting: use button buzzers , can mobilize the enthusiasm of students, help involved and positive thinking, that will make classes much more entertaining and activity Durable and portable: buzzer sound buttons are made of durable and resistant ABS material, even dropped many that still work, lightweight and easy to carry, measures . 97x112x116mm, dimension not too small or too , suitable for any ages Easy to use: contest buzzers are powered by 2 AA batteries (batteries not included), after installing the batteries, simply press the red buzzers to light up, and game buzzers have appropriate volume, loud enough without sounding too loud colour: as shown Material: ABS Package Contents: 4 x Game Buzzers Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.