I was originally trying to get a hold of the CCell "Palm" Battery but the store I wanted to buy it from was out of stock so my friend recommended this to me and I am glad he did. It's very user-friendly. I just twist on the connector to my cartridge and it slides right in and has 360* of mobility. You can choose the temperature by pressing the button 1-5 times then you press and hold the button while you pull. The blue is a pleasant shade and gives me a Pearl from SU vibe. Deff recommend it!