Review on EMAY Bluetooth Wrist Pulse Oximeter - Silicone SpO2 Sensor for Continuous Oxygen & Heart Rate Monitoring, Sleep Oxygen Monitor - Rechargeable with Free App & Overnight Report by Colin Watkins

Comes in a nice plastic box that can be used for storage. The device is worn like a watch with a tight rubber finger grip. It stays in place even when I move around at night. The data is easily transferred to your mobile phone via Bluetooth in the morning. The app is beautiful and easy to read and understand. I would like a place in the app for notes with each morning exertion, like "depleted oxygen concentration setting" or "how I felt at night", whether I woke up, slept well or how I felt after waking up. in the morning, feeling good or having a headache. etc. . I also love this product and also the fact that you can charge it via USB.