Review on 🚴 XOSS G+ GPS Bike Computer with Bluetooth ANT+ Connectivity, Wireless Bicycle Speedometer Odometer and LCD Display, Waterproof MTB Tracker Ideal for All Bikes including Electric Bikes (Supports XOSS APP) by Mike Pearson

This little device seems accurate (I haven't tested it with anything else) and is quite easy to use. I'll be honest because you have to learn to pay attention to the tiny icons on the screen to make sure it's the recording time and mileage. I use it with a Bluetooth wheel speed sensor and a cadence sensor along with a heart rate monitor. The display is clearly visible and is constantly updated so that the information is always up to date. When my learning curve was at its peak, she met all my expectations and I recommend her wholeheartedly.