Used this speaker a fair amount, and it's been really good.

I never updated the firmware on it, and the app control still works on my phone.

Here is the official JBL EON ONE Compact description, pulled directly from JBL Professional's website:

JBL EON ONE Compact — All-in-One Rechargeable Personal PA

The days of sacrificing sound system power and performance for portability are over. The JBL EON ONE Compact packs a professional speaker, a full-featured 4-channel mixer and Bluetooth control into our most compact battery-powered PA, weighing in at just 17.6 pounds. Sound your best in seconds with premium Lexicon and dbx-inspired effects and presets that you can customize right on your phone or tablet using the JBL EON ONE Compact Control app — no engineer needed. Presenters, fitness instructors and emcees will appreciate EON ONE Compact's ducking feature, which lowers background music volume when speech input is detected. True Wireless Stereo (TWS) Bluetooth playback lets you stream music in stereo. And with EON ONE Compact's tool-free, swappable 12-hour battery, you'll keep the party going long after the sun goes down.

Whether you're a singer/songwriter, DJ, presenter, fitness instructor, or you just want to enjoy amazing sound on the go, get ready to #PlayAnywhere with JBL EON ONE Compact.

Key Features:

• Legendary JBL Sound — 112 dB max SPL with deep, uncompressed bass, and an 8-inch woofer that extends low-end response to 37.5 Hz — nearly an octave lower than other PAs in its class.
• Class-Leading Connectivity — Two XLR/TRS combo jacks, one 1/4-inch hi-Z guitar input, and one 1/8-inch aux input; phantom power supports condenser microphones, and pro-grade preamps deliver full, rich sound.
• Extended Battery — Tool-free, swappable battery provides up to 12 hours of playtime; quick-charges in just 2.5 hours, and can be charged while the system is in use.
• Total Control at Your Fingertips — The JBL Compact Connect app allows you to control and stream Bluetooth audio to up to four EON ONE Compact speakers from your iOS or Android device.
• Two USB 3.0 ports for high-speed charging of tablets, phones, and select DJ devices, plus a 1/4-inch passthrough to expand your system with additional EON ONE Compact units.