Review on TREBLAB HD77 - The Ultimate Ultra Premium Bluetooth Speaker: 360° HD Surround Sound, Dual Pairing, 25W Stereo, Strong Bass, 20H Battery, IPX6 Waterproof, Sports Outdoor, Portable Blue Tooth by Keith Morris

At 20% battery it tells you "low battery" about every 30 seconds and doesn't stop until you turn it off. Even if you plug it in, it will keep telling you about it until it reaches a certain high enough percentage. 20% gives you plenty of time for music but becomes useless and annoying because it keeps yelling at you. So unnecessary and annoying. Also, it takes forever to charge. I plugged it in from noon to the next morning and it was still only at 90%. The range is terrible too. Probably about five feet.