Features1. Easy to hide: This ultra small buzzing device can be easily hidden in most places. It is light enough to be fixed with tape or magnets. Using them together or alone will drive them crazy.2. Mischief: The small buzzing device has 7 types of noise that can be switched, including cricket chirping, buzzing, and other sounds, making it very suitable for pranking friends and colleagues.3. Durable battery: Our noise generator prank won't run out in a few days, and the battery can easily support it to run continuously for several months.4. Continuous sound: Simply open it, select an available noise option, and hide it. The best part is that it will continue to make sounds, seemingly forever, and works well as a prank tool.5. Instructions: Please place the battery 2032 on the device using the following method, apply double-sided tape to the back of the device, and stick it under the table. Turn on the switch and wait for the prank sound. If you want to switch the sound, please press the button.SpecificationMaterial: PlasticColor: Purple, Red, Black, Blue, YellowSize: 4 x 2.4 x 0.9 cmWeight: 10 gPackage Include:1x Annoying Beep Office Prank Devices