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.
JBL's latest affordable portable Bluetooth speaker, the Flip3, packs some serious power for its modest size. At $99.95, the Flip3 is a solid option if you're looking for a splash-proof speaker that can be thrown in a tote or a carry-on.