Features: 1. Customizable to record music or whatever you want to say for up to 4 minutes. 2. Function: light sense to trigger button and play music. 3. 3 button cell power supply, 16 0.25W environmental speaker, the sound is large enough. 4. This module has been welded with microphone, key, speaker and battery, etc., and can be used after receiving the product, which is very convenient. 5. Great for Xmas cards, gift boxes, jewelry boxes, crafts, children's toys etc. Specification: Recording time: 4 minutes Working voltage: 3 button batteries 3.0V-4.5V (Batteries are included) You can repeat the recording, each recording will replace the last recording Board size (L*W*H): 46 * 27 * 10mm/1.8 * 1.1 * 0.4in Speaker Diameter: Approx. 40mm/1.6in Speaker Thickness: Approx. 5mm/0.2in Key Cable Length: Approx. 5cm/2in Optional Play Mode: Single Play, Loop Play Package List: 1 * Greeting Card Module Recording and Playback Operating: 1. Press the record button, hear the "DI" sound and release the record button, then speak at the distance of 5-10 cm from the microphone to start recording. 2. Press the record button again, and hear the drop sound release button to indicate that the recording is complete. 3. Then press the play button again to play the currently recorded sound. Press the play button again during playback to stop the sound. Note: The key with red wire is recording key, and the key with black wire is playing key. .