Recommended value for Bluetooth connection interval?

The range of Bluetooth connection intervals is 7.5ms~4000ms, with a unit of 1.25ms.

• The smaller the Bluetooth connection interval, the faster the Bluetooth communication rate, the better the product user experience, and the higher the power consumption will be.
• The larger the Bluetooth connection interval, the slower the Bluetooth communication rate, the worse the product user experience, but the lower the power consumption will be.

Apple's requirements for Bluetooth connection intervals are as follows, see Accessory Design Guidelines for Apple Devices page 114: