Good to know - This HoMedics Modulair wrist massager has 2 active compression zones and 4 compression settings - The massager is powered and controlled by the Modulair Controller unit (sold separately) - It lasts up to 5 hours on one charge, giving you plenty of time to ease those achy joints - Choose from 5 intensity and 3 heat levels - crank it up for post-workout relief or bring it down to relax - The soft-touch fabric and adjustable velcro strap hug your muscles nice and snug - Its quiet operation means you can use it while enjoying your favourite show