ECOXGEAR Sol Jam Solar-Powered Waterproof Bluetooth Speaker - Portable Wireless Outdoor Speaker for Beach, Pool, Camping & Hiking (Black)

Most impressive: Sound qualityThe sound on this thing is excellent for a bluetooth connection! Usually, I experience a noticable 20-30% decrease in sound quality when using bluetooth connectivity but that does not exist with this speaker. I was not expecting such robust sound design from a small speaker. You can enhance the sound with your device's EQ to make it sound even better. The sound output level does not change much when you hook up an aux cord, which is how I will be using it for an art installation project outdoors.I have yet to put it to the power/solar/outdoor test but that is happening next --- so I'm crossing my fingers for an all-out excellent product. The couple of minor criticisms I have is that the volume button build is a bit weird, you have to push really hard to activate those and the battery indicator light; also, you cannot disable the bluetooth function, which means the indicator light is always on and I'm wondering how much power it is going to drain. Hopefully it is not always trying to pair with some device, even with the aux cord plugged in; there should be a bypass, otherwise any bluetooth device could hijack your speaker! **Update on this** While you have an aux cord connected, any bluetooth connection made post aux cord plug in will be disregarded by unit and sound will not play from bluetooth connection until aux cord is removed.*Additional note - if you use the integrated power bank as an output charger, beware that this will drain your battery quickly. Don't count on piggybacking for any extended duration of time unless you are able to charge the speaker each day. I was trying to use it as a self-contained power source for the solar battery and an external looped mp3 player. Had to buy an external solar battery pack to power mp3 separately and am investing in a portable solar panel as a backup for power bank and solar speaker, along with mp3.VERY happy with purchase considering the outdoor use and tricky logistics!