Bests & Worsts Reviews from Amazon

Review for Bluetooth fingertip oximeter. Updated: On the third night, this unit repeatedly failed with full batteries. I woke up at 3am. Was it apnea? Who knows, because this unit died at 11pm. It requires an uninterrupted Bluetooth connection all night or it won't work. My phone was two feet away on the charger because it must remain on all night, but it failed three times, only recording for 2-3 minutes. But how will you know it's dead when you are asleep!? This reveals two fatal flaws. 1) The data is not stored in the oximeter, so if Bluetooth dies, you have nothing. 2) When Bluetooth quits, there is no way to know it. Two other issues surfaced. The display is super bright in a dark room, like a flashlight. It never dims, which explains the poor battery life. It wakes up my wife. Also, the low oxygen beep is a joke. It didn't wake me when my O2 went down to 79%. Impossible to hear. Also, the manual and web site claim it stores the last twelve readings, but that's misleading. It's one single reading, not a stream of data. It's not even an average, it's just a snapshot. Completely unrelated to the Bluetooth recording. Let's face it, this Bluetooth oximeter is a regular oximeter with Bluetooth clumsily tacked on. So it's mostly useless. If you are hoping to get a stream of data, forget it. (Amazon clumps the reviews for *all* this sellers products here, so the positive reviews are for other products. If you check the ratings for this bluetooth app, you will see a zillion complaints. Tons of bad reviews on Google Play Store: "Useless", "App is quite limited", "no data export function", "Incomplete", "Poor graph", "Disappointing", "Poor programming", "Hire more competent programming", "Frustrating". (Many of the 5 star reviews are one word like "vital", which are suspect.) The app is rudimentary junk. Without the app, this is an overpriced toy, no better than the $20 oximeter I already have. This oximeter does not record unless the app is open! So your phone needs to be on all night, all day. Dumb. The magnifying glass doesn't magnify!! (Eventually you discover you pinch to zoom in, but it doesn't say that anywhere. Pinch doesn't work vertically. There are no instructions in the app or on their web site.) Graphs cannot be viewed full screen, even though they are the only way to view your data. You can't trust the app. For example, one part of the app says you wore it for eight hours, but the history page contradicts that. If you quit and restart, then you see today's graphs, but you can't export the data! If you email the data to yourself, it sends a damn photo of the screen, which is useless! Children can write better apps. Even though you paid good money, the app displays an advert before showing the data. That's outrageous. Photos of the screen are very misleading and goofy, because the unit doesn't sense which way is up. So for example, the pulse graph is always upside down for right handed people. That's fruity. If you don't actually care about the data, and don't use the app, then Amazon has tons of $20 oximeters that are cheaper and better. If you want reliable long-term data, this unit simply cannot give it to you reliably.