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.
Itâs the portable option in Amazonâs Alexa family, closer to something like a JBL Flip 3 or UE Boom 2 than one of the Echo devices above. Like those devices, itâs a handsome, cylindrical, lightweight Bluetooth speaker with a built-in battery, which here lasts around 8-9 hours just playing music.