Measures blood oxygen saturation and monitors pulse rate. Ideal for use before and after sports and recreation activities. Simple no-button operation - just insert your finger and wait for results. Auto-adjustable OLED display with 4 viewing angles . Bluetooth wireless technology makes it easy to track and share your data. Use the free Homedics Health+ app. Portable and lightweight. Low battery indicator. Automatic power off. Soft silicone padding. 2-Year limited manufacturer warranty. Includes: 2 "AAA" batteries. Carrying bag. Lanyard.