The Heimdall Emergency Whistle + Lanyard is a lightweight plastic whistle with a purple color and a decibel output of 120 dB. It comes in a pack of 1 and is suitable for various outdoor activities such as boating, swimming, kayaking, and camping. The whistle is designed for emergency situations and can be easily attached to a lanyard for easy access while engaging in water sports or hiking adventures. Its compact size and loud sound make it a reliable safety tool for outdoor enthusiasts.