Many models include built-in speakers (stereo or HIFI) and support audio output via Bluetooth. Some listings note two-way Bluetooth that can act as a speaker or pair with external Bluetooth speakers; a few mention 360-degree sound. Most projectors also offer ports or options to connect external sound devices for improved audio.
Listed lamp or bulb life values include 20,000 hours, 30,000 hours and 50,000 hours. Some listings do not indicate a bulb life.
Most listings state “Battery: No Battery Used” (AC powered). Other listings list removable batteries (for example, 2 AAA Zinc Air, required but not included), and some product descriptions mention a built‑in rechargeable battery with power‑bank charging support.
