Sony WH-1000XM5 Wireless Noise Canceling Headphones - Silver Wireless Technology_Bluetooth This is the 40mm band

This is the 40mm band originally paired with Apple Watches Series 4 up to Series 6 but is also compatible with any series watch that has the smaller case size (38/40/41mm)

38mm Stainless Steel case with White Sport Band

- Easy setup with flexible mounting and free Nest app

Model: FB504

Model Number: CM036188

Sony WH-1000XM5 Wireless Noise Canceling Headphones - Silver Wireless Technology_Bluetooth This is the 40mm bandThe Sony WH 1000XM5 Wireless Noise Canceling Headphones. Silver Version. Features: Industry Leading noise cancellation two processors control 8 microphones for unprecedented noise cancellation. With Auto NC Optimizer, noise canceling is automatically optimized based on your wearing conditions and environment. Magnificent Sound, engineered to perfection with the new Integrated Processor V1 Crystal clear hands free calling with 4 beamforming