Features: -CE &FDA approved- Measure SpO2 and PR accurately- Color OLED display SpO2 and PR、 Pulse waveform and bargraph display- High brightness full color OLED can be used even in dark night- Four viewing angles and six display modes- Four levels adjustable brightness- Low battery voltage indicator- Automatic power off when signal is not available for 4 seconds- 2 AAA batteries support 30 hours continuously- Mini size、 light weight、 convenient to carry- Widely used in hospital、 home healthcare、 oxygen bar、 community medical centre、 alpine area、 sports healthcare etc. Specification: Display 64K color OLED SpO2 Measurement range: 35-99%Resolution: ＼1%Accuracy: ＼2% (70%-99%)、 unspecified (<70%) Pulse rate Measurement range: 30-255 bpmResolution: ＼1%Accuracy: ＼2bpm or ＼2% (select larger) Power 1.5V (AAA size) alkaline battery x 2Supply voltage: 2.6~3.6V Working current ＋30mA Interference resistance against ambient light Deviation between SpO2 in nature indoor lighting condition and in dark room is less than ＼1% Dimension & Weight 57 (L) ～ 31(W) ～ 32(H) mm50g (with batteries) Package Content:- 1 x RPO-50D Fingertip Oximeter - 1 x Lanyard- 1 x English user's manual- 1 x Pouch We will carefully test every item before shipment.