Performance 1)SpO2 measurement range: 0 %~100 %, error: 70 %~100 %: ±2 %; 0 %~69 %: unspecified 2)PR measurement range: 30 bpm~250 bpm, error: ±2 bpm or ±2 %, whichever is greater 3)HR measurement range: 30 bpm~300 bpm, display error: ±1 bpm or 1 %, whichever is greater 4)Resolution: SpO2: 1 %; PR: 1 bpm 5)Measurement Performance in Weak Filling Condition:SpO2 and pulse rate can be shown correctly when pulse-filling ratio is 0.4 %. SpO2 error is ±4 %, pulse rate error is ±2 bpm or ±2 % (select larger). 6)Resistance to surrounding light: The deviation between the value measured in the condition of man-made light or indoor natural light and that of darkroom is less than ±1 %. 7)Pedometer range: 0~65535 steps (resolution: one step) 8)Operating current: ≤150 mA 9)Power supply: built-in rechargeable lithium battery(3.7 V) 10)Safety classification: type BF applied part 11)Waterproof degree: IP67 Physical characteristic 1)Dimension: 53 mm(L)×44.2 mm(W)×16.8 mm(H) 2)Weight: about 80 g(including battery)Q1: Can I have a sample for testing? A: Yes, you can, but you need to pay the sample cost and freight. The sample cost will be refunded after bulk order confirmed. Q2: Do you accept small orders ? A:Yes. If you are a small retailer or starting up business, we are definitely willing to grow up with you. And we are looking forward to co-work with you for a long term relationship. Q3: DO you have inspection procedures for the products? A: 100% self-inspection before packing. Q4: What is the warranty period of the product? A: 12 months warranty and online technical support.