Jawbone announced the newest iteration in its line of wrist-worn UP fitness trackers back in November, but it's taken several months for the new devices to be ready to ship, likely because of all the new sensor additions.
The company began taking pre-orders several months ago and customers who purchased the devices have been waiting patiently for news on a ship date, which Jawbone delivered today.
According to a blog post on the company's site, the UP3 will begin shipping out to customers in the United States on April 20th.
Pre-orders will ship in the order that they were received, and based on the number of orders, Jawbone expects all pre-order customers to receive their UP3 bands no later than mid-May.
According to Jawbone, the UP3 includes several new sensors that give it more advanced health and fitness tracking capabilities. It has a new tri-axis accelerometer, skin and ambient temperature sensors, and "bioimpedance" sensors that let the UP3 analyze a wide range of biometric data, including resting heart rate.
It can track detailed sleep stages, distinguishing between REM sleep, light sleep, and deep sleep, and it can distinguish between different workout activities.