Item Type: Double Tubes WhistleMaterial: Stainless SteelTotal Length: Approx. 118mm/4.6inWhistle Length: Approx. 56mm/2.2inWhistle Width: Approx. 18mm/0.7in Whistle Thickness: Approx. 8.5mm/0.3inSimple and elegant shape, streamlined design, easy to sound, double-hole double-tube design, with alloy keychain 1、The double‑tube whistle has a high pitch of up to 150 dB, which can make a deep sound and remind people around.  2、Survival whistle specially designed for emergency situations, safe and reliable, use anytime and anywhere, strong keychain can be fixed.  3、Ultra‑sturdy and durable structure, stainless steel waterproof whistle, can prevent corrosion and abrasion.  4、Suitable for hiking, camping, hunting, fishing outdoor actiuvities, also fit for lifeguards, coaches and referees.  5、The stylish and unique design is more aesthetic and professional than the usual simple whistle.