3 Ball Respiratory Exerciser (Blue) Spirometer Lung Exerciser PRODUCT INFO 3 Ball Respiratory Exerciser (Blue) Spirometer Lung Exerciser Application:For Home Use Power Supply Mode:NONE Material:Medical grade material, Plastic Shelf Life:3 years Quality Certification:CE/ISO 13485, CE Instrument classification:Class II, Class I Safety standard:None, GB/T18830-2009 Product name:lung smart respiratory exercise three ball breathing trainer Function: Strengthen the lung Size:14cm*14cm*7cm Color:Transparent Accessories:With 3 Colors Balls Packaging & Delivery Selling Units:Single item Single package size: 15X17X7 cm Single gross weight:1.000 kg