The KCASA G20 (sometimes referred to simply as the G20) is a general purpose fitness tracker with built-in heart rate monitor, ECG and blood pressure monitor. It costs less than $50 shipped and comes in five different strap colors — purple, black, blue, light blue and lime green. I’ve been using the G20 for several weeks now and must say it is a pretty decent fitness tracker for the price.
Those who are familiar with fitness trackers will realize by now that the G20 has a strong resemblance to the Fitbit Alta which costs nearly twice as much. While the Alta has all the standard fitness and health monitoring features, it does not have a heart rate monitor, blood pressure monitor and ECG which makes the G20 a device with truly great value.
There are many sub-$50 fitness trackers around with HR and blood pressure monitors but very few that actually have ECG included. If you’re looking for an affordable fitness tracker with a decent set of features, the G20 is probably one of best buys you can find at the moment.
One thing I really like about the G20, is how you charge it. Unlike other fitness trackers or smartwaches that use magnetic docks or mini USB ports for charging, the G20 uses a full-sized USB jack that plugs into any standard USB charging port.
- Heart rate monitor (optical sensor technology)
- ECG and blood pressure monitor
- Pedometer and thermometer functions
- 0.73 inch monochrome OLED display (128 x 88 pixels)
- Android / iOS compatibility (WearHeart app)
- 110mAh battery with 15 days standby time
- IP67 waterproofing
- Silicone straps
- Sleep monitor
- Bluetooth 4.0
- Screen displays:
- Date, time, battery level
- Calories burnt
- Distance walked
- ECG + PPG reading mode
- Heart rate monitor
- Blood pressure monitor
- Message notification
- Find my phone
- Concealed USB charging jack
This design approach may not seem like a big deal to those who are not familiar with fitness trackers but it actually eliminates the issues that are commonly associated with magnetic charging docks or micro USB ports. Some magnetic dock designs may feature weak magnets that are not strong enough to firmly hold the device in place for charging. This results in the charging pins disconnecting sometimes without the user realizing it. This is a problem that affects even $100 smartwatches such as the LEMFO LES-1 that I had reviewed recently.
Micro USB charging ports, on the other hand, usually suffer from premature wear and tear. Like Type C USB ports, they are also vulnerable to accumulating dirt or grime if you use your device outdoors frequently. The USB jack on the G20 is also subject to wear and tear like a micro USB port but since it is a lot thicker and beefier, it should last a lot longer and is certainly easier to clean if oxidation or stains develop on its contact points.
Another thing I like about the G20 is the fact that it does not have any mechanical parts such as buttons. Instead there is a single touch-sensitive button at the bottom of the screen that responds to light touches. Having no mechanical parts is a good design approach as this eliminates any possibility of mechanical wear and tear and also makes the device a lot more waterproof.
The only long term wear that I can foresee on the G20 is its upper slip-on strap which conceals the USB charging jack. In order to access this jack, you’ll need to pry open the strap by twisting it 90 degrees. The fit is quite tight to prevent moisture from seeping in but I believe this tight fit will probably become loose over time. To prevent the strap from becoming loose, it may be a good idea not to remove it too often.
Features and Performance
As a fitness tracker, the G20 has all the features you’ll need to monitor your health and fitness activities. It has a pedometer and sleep tracking features. The accompanying app for the G20 allows you to analyze your sleep or fitness data. A few features that are its key selling points are the heart rate monitor, ECG and blood pressure monitor.
From my experience with heart rate monitors that are worn on wrists, they are reasonably accurate as long as you do not swing or shake your forearm constantly such as when you’re running. When there is a lot of forearm shake, HR accuracy on the G20 becomes very unreliable.
The blood pressure monitor is reasonably accurate and the readings I have obtained so far are very close to the reading’s I get on my Omron blood pressure monitor. I wasn’t able to compare the accuracy of the ECG feature on the G20 against other medical-grade ECG devices so I’m in no position to comment on its accuracy. ECG allows you to monitor your heart’s function and determine if there is anything unusual about its electrical activity.
The G20 features an 0.73″ OLED monochrome display with a resolution of 128 x 88p. Although it is not a color display, the display is bright, sharp and display angles are quite good.
The G20 has a 110mAh battery and a claimed standby time of 15 days. With features that sap battery power such as gesture mode (lifting your forearm to activate the display) and hourly heart rate monitoring turned off, the G20 can last 7 to 10 days of use. If you turn on hourly HR monitoring, gesture mode or check the screen regularly, it lasts about 3 to 4 days before needing a charge.
Using a dedicated fitness tracker such as the G20 is better than using a smartphone if you want a device for monitoring your health round the clock. This is because smartwatches generally do not last more than 24 hours before needing a charge while the G20 can go on for days. The G20 is also a lot lighter and feels more comfortable on your wrist compared to most smartwatches.
To access all features on the G20, the WearHeart app is required. Unlike other fitness tracker apps for cheap Chinese devices that do not work very well (think HPlus Watch for the S928 / Makibes G01), the WearHeart is a joy to use and I’ve no complains about it. In fact, I think it is comparable to Xiaomi’s Mi Fit app.
WearHeart allows you to do everything from configuring your G20 to analyzing your sleep and activity logs. It can also be used to send message or call alerts from your smartphone to the G20. Overall, I’m quite pleased with WearHeart and I’ve had no issues connecting my G20 to it or viewing my log files.
Below are screenshots of the WearHeart app. Click on the highlighted image for a full view of it.
It is important to note that if you want to fully utilize your G20, you must have the WearHeart app installed on your smart device. This is because the G20’s small display can only show you basic information such as number of steps taken, heart rate, battery level, date and time.
To configure your G20 and view other details such as your ECG charts, heart rate charts and sleep activity logs, you’ll need to use WearHeart.