Features: Creative two sound holes design giving out 80 -100db voice, high frequency and loud. Using tough plastic, lightweight and good quality, durable and portable. The back clamp ensures extra security for preventing it losing and enables you to clip it on your waistband or other available places. Supplied with snap clip, convenient for you to hang it anywhere. It can be used for many situations, mountain rescue, marine safety, evacuation, warning, fire wardens, sports training, etc. Specification: Condition: 100% Brand New Material: Plastic Color: Red Quantity: 4Pcs Sound: 80 - 100db Dimensions(L x W): Approx. 7 * 1.9cm / 2.7 * 0.7in Weight: Approx. 31g Packing List: 1 x Pack of 4Pcs Whistles Package List 1Creative two sound holes design giving out 80 -100db voice, high frequency and loud. 2Using tough plastic, lightweight and good quality, durable and portable. 3The back clamp ensures extra security for preventing it losing and enables you to clip it on your waistband or other available places. 4Supplied with snap clip, convenient for you to hang it anywhere. 5It can be used for many situations, mountain rescue, marine safety, evacuation, warning, fire wardens, sports training, etc.