Answer:
The HM-21SU is compatible with standard USB flash drives, SD cards, MMC media, and 3.5mm AUX line inputs for external audio routing. For electrical power, the unit operates via a 12V DC interface using 8 x UM-2 cells (they are not included), an optional rechargeable battery (they are not included), or a direct 12V car battery (they are not included) power connection.
The Hitune Bass HM-21SU provides integrated digital playback and multi-source connectivity to handle diverse public address requirements:
- Digital Media Inputs: Integrated reader supports playback of audio files directly from standard USB storage drives, SD memory cards, and MMC media.
- Analog AUX Input: Includes a dedicated 3.5mm AUX auxiliary line-in jack, enabling direct audio patch-in from external media players, mobile devices, or secondary communication consoles.
- Integrated Audio Controls: Equipped with a detachable omnidirectional dynamic microphone featuring integrated thumb volume control and a tactile Press-to-Talk (PTT) switch, alongside a 16-second voice recording/playback loop and built-in siren mode.
- Power Supply Compatibility: The internal amplifier operates on a 12V DC system powered by 8 x UM-2 dry cells (they are not included), a rechargeable battery (they are not included) pack, or via an external 12V car battery (they are not included) cigarette lighter / DC terminal cable.
