HOW TO USE BLOOD PRESSURE CUFF: To learn how to use the product and get accurate results, you must watch the product video or read the instruction manual included in the package or attached here. Since the date and time are not displayed, you must keep your blood pressure record manually with the date and time. AUTOMATIC BLOOD PRESSURE MONITOR WITH VOICE FUNCTION: The wrist blood pressure cuff announces the measurement results with voice. The voice can be turned off by following the instructions in the user manual or instruction file (IFU) on the listing. However, the voice can only be turned off once, if you turn off the device and turn it on again, the voice will be back because it is a blood pressure monitor with voice. The voice cannot be turned off permanently. 2 x 99 MEMORY BLOOD PRESSURE MONITOR: Switch between 2 users to store measurements separately and record up to 99 measurements for each user, for easy blood pressure monitoring. To select a user, follow the instructions in the instruction file. ADJUSTABLE WRIST BLOOD PRESSURE MONITOR: The wrist strap can be adjusted to fit wrists from 5.3 inches to 7.7 inches, making it suitable for the vast majority. WHAT IS INCLUDED IN THE PACKAGE: A wrist blood pressure monitor, 1 case, 1 C-type charging cable, and instruction manual to help you easily use the device. You don't have to worry about the battery because you can always charge it with a C-type cable. SPECIAL INSTRUCTIONS: This wrist monitor only works with 1 button. The operation is complicated, and to gain a full understanding, please read the user manual to understand all the functions. This blood pressure monitor has a voice prompt that cannot be turned off permanently. To get accurate results, carefully follow the instructions on the box and in the user manual.