Place of Origin:China Brand Name: Volador,ODM&OEM accepted Power Source:Electric Material:Acrylic, Plastic, Resin Shelf Life:1years Quality Certification:CE Instrument classification:Class II Safety standard:GB/T18830-2009 Product Name:Doppler Fetal Monitor For Baby's Heart Type B: application part Certificate: CE MOQ:100 Pcs Power Source:Electric Frequency:3 MHz Battery:AA battery (Battery included) Accuracy:±2 bpm Color:white Size :135*70*40mm