I saw this on the Devina Mccall television programme on the menopause and how it could improve sleep it scored extremely highly with the testers. I was desperate to improve my sleep and decided to purchase. It is extremely easy to use and recharge and I loved the simple design . I have had mine for around 2 years with no loss of battery life . My sleep has improved beyond my expectations and has improved with use. I love the 20 minute function to get you to sleep and if I wake in the night and struggle to return to sleep I simply use this function again and it usually sends me back to sleep . I wouldn’t be without it but I am now sleep meditation free and have been almost from the start of using this product . I am delighted