Product Name: Portable EEG Machine Psg Polysomnography for Sleep Apnea Diagnosis Model NO.: A22 Group: Middle-aged and Old Certification: CE, ISO13485 Type: Patient/Fetal/Maternal Monitor Classification: Physiological Functions of Diagnosis and Monitoring Equipment Channels: 22-Channel Power: Rechargeable Lithium Battery Operating Mode: Continuous and Intelligent Operating Feature: Portable, Light and Convenient Function: Analysis and Screening of Sleep Disorder Patients Ambient Temperature: -20