THE SMART BLOOD PRESSURE MONITOR YOU WILL ACTUALLY USE QardioArm is the wireless blood pressure monitor that fits into your daily life.Helping more people improve their heart health with iOS and Android compatibility. Weight 0.68 lb (310g) including batteries Dimensions 5.5×2.7×1.5in (140x68x38mm) when closed Power 4 x 1.5V batteries (size AAA), supplied Operating Conditions 50~40F (10~40C) temperature, 15~90% relative maximum humidity Storage Conditions -13~158F (-25~70C) temperature, 10~95% relative maximum humidity