Huawei Band 4 and Band 4e Review – Using them together also makes sense - NotebookCheck.net Reviews
Huawei Band 4 Smartwatch - 1Sell
Amazon.com: HUAWEI Band 4 Pro - Smart Band Fitness Tracker with 0.95 Inch AMOLED Touchscreen, 24/7 Heart Rate Monitor, Indoor Outdoor Pro Tracking, Sleep Monitor, Built-in GPS, 5ATM Waterproof - Graphite Black