It's a disposable programmable voice chip
The OTP voice chip converts the voice signal into a number through sampling, stores it in the ROM of the IC, and then restores the numbers in the ROM into a voice signal through the circuit.
OTP(One Time Programable) refers to a one-time programmable voice chip, the voice can only be written once, suitable for application in the need to modify the voice, the voice length is short, from the length of playback can be divided into 10 seconds, 21 seconds, 42 seconds, 85 seconds, 170 seconds, 340 seconds.