JZK - 301 OLED Instant Read Digital Fingertip Pulse Oximeter SPO2H Health Monitoring Display OLED Instant Read Digital Fingertip Pulse Oximeter SPO2H Health Monitoring Display Description: The pulse oximeter, based on all digital technology, is intended for noninvasive spot-check measurement of function oxygen saturation of arterial Features: Easy to read and color OLED display Lightweight for carrying and pulse curve display Adjustable display brightness and automatic switch-off Visual alarm function, real-time spot-check and low battery voltage indicator Standard two AAA 1.5V batteries ( not include ) that support more than 20 hours continuous work Suitable for sports at high altitudes such as mountaineering, skiing and aviation sports Particularly suitable for person with heart failure, chronic obstructive pulmonary Suitable for: ward care, home health care, patient testing, outpatient medical Usage: Install 2 AAA batteries ( not include ) Put one finger into rubber hole of the oximeter with nail upward, then release the clamp Press power button to turn the pulse oximeter on. The oximeter will automatically be powered off when no finger in the device for longer than 16 seconds Read correspondent data from display screen   Item Type: Blood Pressure For (Blood pressure): Finger Power (W): 1.5 V Materials: ABS   Package weight: 0.102 kg Product Size ( L x W x H ): 6.00 x 3.50 x 3.00 cm / 2.36 x 1.38 x 1.18 inches Package Size ( L x W x H ): 9.50 x 9.00 x 4.00 cm / 3.74 x 3.54 x 1.57 inches Package Content: 1 x Digital Fingertip Pulse Oximeter, 1 x Retaining Strap, 1 x Belt Pouch, 1 x English Manual