Emergency whistle with 6 functions:whistle 1.material:ABS 2.size:8.0*3.0*2.5 CM 3. Requires 3XAGB button cell batteries(included) 4.6 functions:whistle,led light,mirror,magnifier,compass,thermometer 5.use for camping or travelling 6 packing:clamshell or blister card or according to your request