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Features ? Small & lightweight design (total 30g without batteries) ? Dual color OLED display ? 6 display modes ? Display SpO2, PR, PI, Pulse bar, Plethysmogram ? Low power consumption, automatic power off design ? Battery-low indicator ? Audible & visual alarm ? 2 AAA alkaline or rechargeable batteries ? Adjustable brightness Standard Accessory ? 2 AAA Alkaline batteries ? Operating manual ? Hang string