Features: The electronic can mouth , and is very suitable for referee coaches, P.E. teachers, navy, camping, sports competitions, traffic guides, training, emergencies. There are 3 tones and 3 levels to meet different needs. High , can provide to 120-150dB sound . It is easy to attract attention. At the same , compared with traditional whistles, it can also make a louder, and consistent voice. can be used for lighting, or camping. flashlight can also be used to send SOS for outdoor signal. This electronic is made of high-quality ABS environment-friendly materials, tasteless and healthy. With lanyard, suitable for various indoor and sports. The 6F22 9V dry (not included) is used for longer and more use. Specifications: Item: Electronic Material: ABS : 6F22 9V Dry (not Included) Size: 14*4.3*3.3cm Package Size: 16.2*5.6*4.1cm Package Weight: 99g Package List: K21058BL 1* Electronic