Good to know- This Homedics universal battery can be used with all Modulair wraps - just switch it out as and when you need- The SMRTflex chip auto-detects which wrap the battery is attached to and powers up accordingly- Pick from 3 heat, 5 intensity and 4 compression levels - great for unwinding after a long day or an intense workout- It lasts up to 5 hours on one charge, giving you plenty of time to ease those achy muscles- It'll be fully charged again in 2 hours with the USB-C cable- You can kick back on the sofa with no wires to get in your way