Based on the users' reviews of the Pulse Oximeter app, here are three cons and pros in 15 words or less: **Cons:** 1. Accurate readings often inconsistent, causing users to question app's reliability. 2. Difficulty in calibrating the app, leading to frustrating experience. 3. Limited features and lack of customization options disappoint users. **Pros:** 1. Easy to use and navigate, even for those new to pulse oximetry. 2. App provides clear and concise readings, helping users track health. 3. Convenient and portable, allowing users to monitor health on-the-go.