Just press it to make a sound, which is fast and convenient. The bottle is small and easy to carry. Due to its special structure, a loud sound is produced by compressing air. Push the handle to make a loud sound. The bottle is made of high-quality steel and the speaker is made of resin. The product length is 12.3 cm, the width is 3.5 cm, and the height is 4.3 cm. Suitable for game competitions, rowing competitions, sea rescue, opening ceremonies, dragon boat competitions, track and field sports, hiking, cycling and other scenes. Product Name: Loud Speaker Material: steel, resin Color: Blue Pronunciation: about 115-130 decibels Sound transmission range: about 500m Features: Handheld, small, easy to carry Size details: 123mm x 35mm x 43mm/4.84in x 1.38in x 1.69in (approx.) Note: Due to differences in light and screen settings, the color of the item may be slightly different from the actual picture. Please allow slight size differences due to different manual measurements. How to use: Keep the bottle upright before use, tighten the horn head and press the top button, the horn will sound immediately. Package list: 1 x loud speaker