1. Max length: 60inches / 152cm.
2. Retractable button and lock pin.
3. Left Button: Save Measurement Button. Short press for sending data to phone, long press for clear to 0.
4. Middle Button: On/ Off Button. Short press: on, long press: off.
5. Right Button: Unit Button. Short press: switch between inches and centimeter, long press: switch between length and circumference.
6. Easy to carry and store. With small size and lightweight body, easy to put in handbag or pocket, convenient to bring and store when outdoor.