Local playback and recording: A compact voice recorder that also serves as a keychain. It enables local playback of recordings and can be used for casual music listening during downtime or while traveling, making it a practical travel companion. Onekey recording and saving: Simple operation with a single button to start recording and a quick press to save. The device ensures the recording is saved before power off for data integrity. Autosave on power off: When the system detects low battery, it automatically saves the current file and shuts down to prevent any data loss. Long recording time and efficient power use: 25 hours of uninterrupted recording on a builtin energy polymer lithium battery, supported by an intelligent power saving system. The compact size is preserved while enabling longterm use. Compact and reliable design: Small, lightweight form factor suitable for everyday carry on a keychain without getting in the way. Performance and compatibility: Records locally with straightforward operation and playback on the device itself, suitable for everyday note taking and quick audits of recordings without extra software. Use scenarios Business meetings and interviews: Capture accurate notes and key quotes without fumbling with devices, then review on the go. Lectures and classes: Record lectures for later study, review complex points, and organize ideas alongside your notes. Travel and daily life: Listen to music during downtime while keeping a discreet, readytouse recording device on your keychain.