Features for Pulse Oximeter: - Measure SpO2 and PR accurately- LED display for SpO2 value and PR value， bargraph display- 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. Measure SpO2 and PR accuratelySpecification for Pulse Oximeter: Display LED display 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-8C Fingertip Oximeter- 1 x Lanyard- 1 x English user's manual- 1 x PouchNote: We will not include batteries， according to China law， batteries are not allowed for international air transportation.