Features: 1. The pulse oximeter for sports has 2-Direction Display adjustable. 2. Reliable accuracy and durability. 3. Automatic power off when no signal. 4. Small and light weight, convenient to carry. 5. Low voltage indicator, Real-time spot-checks. Specifications: Material: ABS Color: Bule Power by: 2xAAA Battery (not included) Package Included: 1 x Fingertip Oximeter for Sports 1 x Instruction Manual 1 x Portable Lanyard Notes: The battery installed in the device is in two opposite directions. When you install the battery, you need to check the positive and negative signs on the battery slot first, because the wrong polarity will cause the device to not work properly. ACCURATE OXYGEN SATURATION AND PULSE RATE READINGS IN ONE DEVICE: The Fingertip Pulse Oximeter monitor fits all finger sizes from kids above four years old to adults as it measures the level of oxygen in the blood and reads the pulse rate in just eight to ten seconds. It is crucial to use the device in a stationary position and not while in motion for precise readings. FAST & CONVENIENT READINGS: SpO2 and Pulse Rate are graphed on the bright LED display. The LED display cover prevents ambient light washout, making readings crisp and clear. Average time for a reading is 8~10 seconds. LOW POWER CONSUMPTION: The oximeter automatically powers off when not in use and delivers up to 24 continuous hours of battery life. PORTABLE AND LIGHTWEIGHT: Attach the included lanyard to the case or directly to the oximeter for easy reach anytime. DESIGNED FOR HOME USE, EXERCISE OR TRAVEL: While the BDUN Fingertip Pulse Oximeter is handy for detecting vital signs, it is not intended for medical use but rather for situations where you need to know your oxygen level before and after your workout or sports such as running, hiking or cycling, or while traveling in an aircraft.