Whistle Key Finder This fantastic Whistle Key Finder beeps and flashes when you whistle! A great way to find your keys or handbag, it measures around 2.7 cm x 5.1 cm x 1 cm The key finder keyring takes 2 x LR41 batteries which are included This makes a wonderful stocking filler and novelty gift for men, women and teens! Perfect gift or present for your Uncle Niece Nephew Brother Sister Boyfriend Girlfriend Husband Wife