final --> for primitives --> value can't change. for non-primitives --> you can't change the reference and point it to another object. Note : It is different from immutability.
Hands down, the Bluetooth speaker with the longest battery life is the Fugoo. It offers up to 40 hours of battery life, nearly twice the battery life of other leading Bluetooth speakers in this category. Given how long its battery lasts, you might even forget that the Fugoo needs to be plugged in to charge.
April 20, 2016: The Peachtree Audio Deepblue2 replaces the Marshall Stanmore as our pick for the best home Bluetooth speaker thanks to its performance for our listening panel against 11 other pieces of hardware we selected after 20 hours of research.