This luxurious plush terry cloth hot water bottle cover features a soothing massager. The vibration creates small therapy waves and is ideal for non-invasive pain relief. The convenient battery operation requires 2 x AA batteries(included). Operational with or without the massage. Hot water bottle not included.We treat everything from arthritis, pulled muscles, inflammation, and fevers with ice packs or heating pads. Hot and cold therapy can be extremely effective but it is important to know what to use hot and cold for. Generally cold therapy or cryotherapy is used for the treatment of acute injuries or pain. It reduces blood flow to a particular area significantly reducing inflammation and swelling that causes pain. Heat therapy is used for the treatment of muscle pain or stiffness. It improves circulation and blood flow and can relax and soothe muscles and heal damaged tissue.