1 Piece Outdoor Multi-Function Whistle, Plastic Whistle Contain Compass, Temperature Display and Whistle 3 in 1 Emergency Whistle Contain Compass, Temperature Display and WhistleProduct dimension: Whistle measured: 1.3″ x 1.1″ x 2.4″/27 x 34 x 60 mm.And has super light weight around: 0.04 Ib/16g, you can easily put this whistle to your pocket.Product material: Our whistle are made from ABS which means it is safe and durable, feel free to use.Wide application: It is not just a whistle for make sound, you can use this multi-function whistle to save yourself when you are in emergency.Emergency whistle This three-in-one product of the collection combines the functions of whistle, thermometer and compass. That is very useful for explore.