Echo Microphone - Pack of 12 Amazing Variety Kid's Party Mikes - Ideal for Themed Birthday Parties, Holiday Gifts, Party Favor Giveaways, BBQ s, Pretend Play, Graduations.. and much more! 12 pieces Party Kids Echo Microphones. Perfect party favors and a noise maker for your party, comes in adorable color, durable and longer lasting toy microphone. Measures 7  inches high each. Echo Microphone works like a real microphone, magnifies your voice, it vibrates and generates an echo that will love by children and adults. No batteries needed, just hold it near your mouth then start making noise!