Features: Power supply: button battery Control method: button control, light-sensitive control, wired double button control (optional) Audio output: 0.5W/16? Recording time: 30s Switching method: repeatedly store Module size (L × W): 50 × 40 mm / 1.97 × 1.57 inches; Speaker size: 30 mm / 1.18 inches. Gross weight: 50 g Instructions: 1. Long press the record button, then start recording after a beep. After the 30 seconds, a double beep sounds indicating the end of the recording. 2. Press the play button to play your recording once all recordings are finished. Press the play button to stop playback while playing a recording. (For button control or hard-wired second button control modules) 3. This module plays your recording when exposed to light after the recording is complete, and stops playback when you are not in the light. (For photosensitive control module)Package Content:1 × Recordable voice module with 3 button batteries