1 Battery voltage 3.7V 3.0V 4.2V2 Battery capacity 50mAh ---- ----3 Pedometer working current 35uA ---- 40uA4 Sleep current (average) 4uA ---- 7uA5 Backlight current 3mA 1.5mA 3.5mA6 Minimum walking speed 60 steps/minute ---- ----7 Maximum walking speed 144 steps/minute ---- ----8 Step counting range ---- 10 steps start 999999 Sleep state ---- stand still for 1 minute ----10 Charging time 2.5 hours - 3 hours11 Fully charged time 50*90%/(0.035*8+0.004*16+3*0.014)/30 = 3.8 months 1Accurately Track Your ActivityThe 3D Pedometer uses the latest 3D Silent Accelerometer Sensor Technology to track your daily activity with accuracy.It also count steps up to 99,999 , helping you keep track of your progress and stay motivated to achieve your fitness goals. 2Simple & Easy to UseOnly one simple button in use. Hold press the button on the back for 5 seconds to get the step to zero.No Bluetooth, Downloads or Smartphones Connections required. Perfect for all Ages (Adults, Seniors and Children). 3Extra Large Digit DisplayThis pedometer makes your life more sporty. A practical pedometer with LCD display can count your steps.With so large screen display,you can clearly and easily read the numbers at a glance. 4Easy to CarryLight, Compact, Durable and Water Resistant.It has a dimension of 7.5*3.4*1.6cm . Its easy for you to wear it around your neck with the included Lanyard ,place in pocket or bag or clip to pocket or hip. 5Back LightIts equipped with a back light,so your can use it free without the limit of time. Just press the RESET button for once ,the back light will be on 3seconds to help your read the steps more frequently.