Power supply voltage VBAT ranges from 3.6V to 5.5V. Built-in 3-channel high-performance LDO circuitry, requiring no external power supply chip and only a few external resistors. High-performance 32-bit CPU, supporting up to 220MHz operating frequency. Built-in 640KB SRAM and 512-bit EFUSE processor (BNPUV3.5). High-performance voice recognition, voiceprint recognition, command word self-learning, voice detection, trial learning functions, and voice noise reduction. The product features a built-in high-performance, low-power AUDIO CODEC module, supporting single-channel ADC sampling and single-channel DAC playback. It supports AUTOMATIC LEVEL CONTROL (LAC function) and various sampling rates including 8kHz, 16kHz, 24kHz, 32kHz, 44.1kHz, and 48kHz. Additionally, it supports one IIS audio expansion path and one PDM interface, which can connect to one or two data MEMS microphones. The ambient operating temperature ranges from -40°C to +85°C, while the storage temperature ranges from -55°C to +150°C. Color: Black Material: PCB Package Contents: 1*Module 1*Speaker 1*Microphone 5*NRK3102 chips 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.