Features: brand new and high quality An infusion reminder equipped with a for smart sensor can monitor the change of liquid in the infusion tube in real for time. Lightweight and convenient, the impact on the infusion tube is minimized. Detection sensor technology makes detection more accurate and stable. Built-in buttons can be easily used for more than one year. If used intermittently, it can be used for several years (please keep it dry). Optimize one-handed operation and structural design to further enhance the portability and robustness of the product. Optimize the circuit and structure design, and appropriately increase the volume stability without basically increasing the power. Suitable for infusion tubes of various medicines, blood, nutrient solutions, various materials and colors. Specifications: Material:ABS Size:Approx.3.5x5.5cm/1.37x2.16inches Instructions for use: Charge before use 1. Power on: clip the reminder to the infusion tube, press the power button to hear the power on prompt to enter the detection state, and the green light flashes at the same for time. 2. Sound switching: Press and hold for 3 seconds in the shutdown state, and release the button after hearing the prompt tone. The sound switching is successful, and the startup enters the detection state. 3. Reminder: When the liquid in the infusion tube changes from presence to absence, a reminder will sound and the red light will flash. 4. Shut down: press the power button, there will be a beep when shutting down, all the indicators will be off, and the work will stop. Note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thanks for your understandings. Package includes: 1 x Infusion Reminder 1 x Sling