Huawei Watch D3 pumps up its health-monitoring credentials

Huawei has released the Watch D3, the third generation of its blood-pressure-measuring wearable, as the company continues plowing a relatively lonely furrow in cuff-based technology. The D3 is an intriguing device for anyone seeking more credible blood pressure readings than many smartwatches claim to provide. Where many brands use optical technology to estimate blood pressure, the D series uses a pump built into the watch and an inflatable airbag inside the strap.