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.
Tech Specs: Braven describes the BRV-HD as the biggest, baddest, BRV speaker yet. The BRV-HD Bluetooth Speaker packs high definition audio into a rugged, water-resistant package with 28 hours of wireless play time. You can take into the elements with its shockproof exterior and aircraft-grade aluminum grill.