Dear，Pls leave a massage to tell us what design (Color) do you want.thank you.

Technical Parameters Display Mode: Dual LCD Display，the display direction can be changed SpO2，Pulse rate，Pulse bar，waveform(4 display modes) SpO2 measuring range: 0%-100% Accuracy: When the SpO2 measuring range is : 70% to 100% ，the permission of absolute error is (÷) 2%; below 70% unspecified Resolution: SpO2: 1% Pulse Rate: 1bpm Pulse Ratio: 30-250 BPM 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 ÷2bpm Or 2%(select larger). Resistance to surrounding light:The device between the value measured in the condition of man-made light and that of darkroom is less than (÷)1% Alarm function:Detected data going beyond limit alarm (when the SpO2 is below 90%，or the pulse rate is not between 50bpm and 120bpm， the alarm occurs);Low power alarm Safety Type:Interior Battery，BF Type Storage Environment:Temperature:-40oC~+60oC;Relative humidity:5%-95%; Operative Environment:Temperature: 10oC~40oC; ;Relative humidity:30%-75%; Power supply requirement:3.6V DC~4.2VDC Battery requirement:3.6V rechargeable buttony lithium battery (1 unit) Dimensions:46(L) ≠ 40(W) ≠29 (H) mm Weight:About 35g (with 3.6V rechargeable buttony lithium battery )