Outdoor Training Referee Coach Chargeable Electronic Whistle

Product Usage:
1. Pedal, command, life-saving
2. Military training
3. Sports competition and training
4. Pigeon and pet training

Product parameters:
1. Battery model: CR2032 x4
2. Decibel: Maximum 125DB +/- percent 5
3. Product size: 138x385x33.5mm