Oura Ring 5 review highlights smaller design and longer battery life

The Oura Ring 5 is roughly 40% smaller than its predecessor, with the width reduced from 7.9 mm to 6.09 mm, thickness to 2.28 mm and weight down to about 2 g. Despite the reduced size it offers a battery life of six to nine days per charge, compared with five to eight days on the Ring 4. The device uses fewer light paths (12 versus 18) but with four‑times brighter LEDs, which Oura says improves nighttime HRV accuracy by 12% and workout accuracy by up to 19%.

Pricing starts at $399 for the base model, $50 higher than the previous generation, with a $5.99‑per‑month subscription required for full health‑tracking features. Sensors include red, green and infrared LEDs, a digital temperature sensor and an accelerometer, and the ring remains water‑resistant to 100 m (IP68) with Bluetooth 5.0 connectivity. Reviewers note the slimmer, lighter form factor makes the ring less obtrusive for daily wear, but the workout heart‑rate data is still inconsistent and the limited size range (sizes 6‑13) may not suit all users.