Play when the magnet is close, stop playing when the magnet moves . Widely used in greeting cards/gift boxes/memory albums/music albums, etc. Built-in 4M memory Powered by coin cell 2032 or 2032 rechargeable battery, rechargeable (battery not included) Supports 99 recordings that can be deleted Can be connected to computer to download sounds Can be connected to door magnetic induction playback Can be connected to light-sensitive playback switch Support AUX recording or MIC recording Note:Due to different production batches, components may be different, which does not affect use. Colour:Green Material:PCB+components Package Contents: 1 * Voice Recorder Chip Module with 1pcs magnet Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.