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.
After testing more than 30 Bluetooth speakers in all shapes and sizes, our top overall pick is the Fugoo Style ($200, $179 on Herman Street) because of its excellent audio quality, compact and waterproof design and long battery life.