How loud is the Heyday Portable Party Speaker Large?

It is built to fill a room or a small outdoor space, and its size gives it more output than compact Bluetooth speakers. It will not match large name-brand party speakers with dedicated woofers and tweeters.

Does it have an app or EQ controls?

No. It pairs over Bluetooth and plays, with no companion app, equalizer or light show. Rivals at the same size often add those features.

There is no stated water-resistance rating, so keep it out of rain and away from pools and sprinklers. Treat it as an indoor and dry-outdoor speaker.

How long does the battery last?

Battery runtime depends on volume, and loud playback drains it faster. Charge it fully before an event and keep a charger or power bank handy for long days.

Can I connect a microphone or another speaker?

It is a single Bluetooth speaker with no stated mic input or stereo pairing feature. For a mic or multi-speaker setup, look at party speakers that list those inputs.