Dwd-2704:fingertip pulse oximeter Features The device can accurately measure spo2 and pulse rate in a 2% tolerance. The device will power off automatically without the signal for 4 seconds. Two aaa size batteries are required for operating, and the continuous working time is 12 hours. When low-voltage warning is shown on screen and the malfunction may be caused. The device is so light that its weight with batteries is about 50g. It shows waveform Specification A. Display mode: 64k color oled display Spo2 display: 35%~99%, Pulse rate display: 30bpm-240bpm, Pulse wave's intensity display: 15-segment bar-graph display Low battery voltage indication: segment oled signal B. Power supply requirement: 1.5v (aaa size) alkaline batteries ¡Á 2 C. Operating current: ‹ 60ma D. Resolution: spo2 +-1% Pulse rate +-1bpm E. Accuracy: spo2 +-2% (during 70%¡-99% No definition (