made of high-quality plastic material,simply press the REC button to record your voice,then press the top button to play the recorded sound,use it to record specific words or phrases to show your dog how it works and your pet will learn how to use the button to express its needs,each one need 2pcs AAA batteries(not included in package), custom logo is welcomed,for more information or sourcing any product you want, please contact with our info center.