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.
iFrogz Tadpole. OK, now here's the world's smallest Bluetooth speaker. I think. Also probably the cheapest one, at just $19. The company wisely doesn't make any great claims for the Tadpole, only that it delivers a two to four times volume increase compared to a smartphone's built-in speaker, a company rep told me. It's available in pink, black, white, red and blue. To go to CES 2013 Bluetooth Speakers A - H, click here.