1. The electronic button can avoid mouth contact, suitable for referee coaches, P.E. teachers, navy, outdoor camping, sports competitions, guides, pet training, self-defense emergencies. 2. There are 3 shades and 3 levels to meet different needs. High volume, can up to 120-150 decibels of sound power. Easy to noticed while also producing a louder, stronger and more sound than whistles. 3. An LED light, which can be used for lighting or outdoor camping. It can also be used as an emergency flashlight, and can also send out SOS lights, which is convenient for outdoor signals. 4. This electronic is made of high-quality ABS environmental protection material, odorless and healthy. 5. Using 6F22 dry battery, the use time is and more durable Power supply mode: dry battery (battery model: 6F22 9V)(without battery) Colour:black+blue Material:plastic Package Contents: 1 x Electronic Only the above package content, other products are not included. Note: Light reflection 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.