The piece on the clip alarm is called the speech piece. First, some simply play voice is the WTV voice chip, WTH voice chip, WTN voice chip can be used for example WTV: OTP disposable voice IC chip; When the sampling rate is 6KHZ, the speech length is 10s, 20s and 40s respectively. Four types of package: DIP16, SOP16, SOP20, TSSOP16; Support DAC output and PWM output two ways; Built-in power amplifier output, can directly drive 0.5w8 speaker; Embedded high-speed DSP processor core processor, with strong programmable ability; Built-in 16-bit dac converter, built-in PSG speech synthesizer, professional audio effect output; It can easily combine the voice through the professional upper computer software, can be inserted into the silent, and does not occupy the voice space, the same voice can be repeated; The BUSY output mode of voice playback signal can be set arbitrarily. High-end software supports wav, mp3 two commonly used audio formats; A variety of flexible control modes, such as standard key control, first-line serial control, second-line serial control, three-line serial control, parallel port control and other modes; The main frequency adopts RC oscillation mode, and the external 32K crystal oscillator can be accurately timed. The voice chip can customize special functions according to user requirements; Sleep arbitrary control, sleep static current consumption is less than 2uA; Operating voltage range 2.6v ~ 3.6v. Second, some irregular voice replacement, you can use WT588D voice chip: 28-pin module package, single chip solution; ? Embedded unique voice speech processor, so that the speech performance is very natural and pleasant; ? Built-in 13Bit\/DA converter and 12Bit\/PWM audio processing to ensure high-quality voice output; ? Support loading 6K ~ 22KHz sampling rate WAV audio; ? Support DAC\/PWM two audio output modes; ? PWM output can directly drive 0.5W\/8Ω speaker, push-pull current is abundant; ? Support key control mode, one-line serial port control mode, three-line serial port control mode; ? A variety of trigger modes can be set under the key control mode; ? Set any BUSY output mode to display voice playback status signal; ? Load up to 500 voices for editing; ? 220 segments can control the address bits, a single address bit can load up to 128 segments of voice, address bits in the voice combination playback; ? The voice playback stops and immediately enters hibernation mode; ? It is equipped with WT588D VoiceChip upper computer software, with simple interface and convenient use. Can greatly play the WT588D08\/16 functions; ? In the software, you can complete control mode setting, voice combination, voice calling, mute insertion and other operations; ? The mute can be inserted at will, and the mute time range is 10ms ~ 25min; ? Working voltage VDD: DC2.8 ~ 5.5V, VCC: DC2.8 ~ 3.6V; ? Hibernation current is less than 10uA; ? SSOP28, DIP28 two encapsulation modes; ? Strong anti-interference, can be used in the industrial field.