❃❃ Item: MP3 Player Audio Voice Module. | ❃❃ The DFPlayer perfectly integrates hard decoding module, which supports common audio formats such as MP3, WAV and WMA. Besides, it also supports TF card with FAT16, FAT32 file system. | ❃❃ Supported Sampling Rates (kHz): 8/11.025/12/16/22.05/24/32/44.1/48; 24 -bit DAC output, support for dynamic range 90dB , SNR support 85dB. | ❃❃ You can play the designated music without any other tedious underlying operations by a simple serial port. | ❃❃ Control modes: I/O control mode, serial mode, AD button control mode.

Supports 3-5.5V power supply. | Uses: Microcontroller, ARM, FPGA, for Arduino and other MCU's TTL serial port communicates with RS232 level devices. Serial expansion of the device. RS232 port communication with Computer PC. | RS232 port communication with computer PC. | Can be used for GPS, electronic compass, car detection, hard disk maintenance etc | In order to facilitate the use of the product, each pin is marked, and a schematic diagram of the product is printed on the back of the product.

❃❃ Fan size: 40x40x10mm(L*W*H); Rated Voltage: 5V DC, Current: 0.21A. | ❃❃ Airflow: 3CFM, Speed: 4200±5%PRM, Noise: 22 DBA. | ❃❃ Bearing Type: Oil Bearing. | ❃❃ Lead Wire: USB; Length: Approx.1m / 39.37 in. | ❃❃ Package Included: 4 * DC brushless fans.(Notice: 'DO NOT GET WET' or 'Put it in a humid environment'; Or it will stop working. Any questions, you can contact us and we will help you.)

2PCS Optical Fingerprint Reader Sensor Scanner Module Optical Fingerprint Module Door Lock Access Control for Arduino | Resolution: 500dpi; Supply current: <60mA;Fingerprint image entry time: <1.0 seconds | This module can be used for fingerprint collection, fingerprint registration, fingerprint comparison and fingerprint search | UMLIFE sensor is an ideal device for door locks, safes, guns, financial and other security areas | AS608 Optical fingerprint reader module sensor

It can be wildly used to wireless remote control, somatosensory devices, RFID, NFC, smart grid, smart home, wireless audio etc. | 5PCS NRF24L01 8 Pin Socket Breakout Adapter Board: On-board AMS1117-3.3 chip, a simple socket breakout board which is for 8-Pin NRF24L01 wireless module | 5PCS NRF24L01+PA+LNA RF Transceiver Module with SMA Antenna: Built-in 2.4Ghz antenna: available software to set the address, only received local address when output data(Provide interrupt instruction), can be directly connected to a variety of microcontrollers | RF24L01+ Breakout Adapter: Small power on SMD LED indicator, On-board 3.3V voltage regulator, which accepts +5V power supply input and provides 3.3V for the attached "nRF24L01+" module. | The packing list includes: 5 * NRF24L01+PA+LNA Wireless Transceiver RF Transceiver Module; 5* SMA Antenna 2.4G 1100m; 5 * NRF24L01+ Breakout Adapter

✹✹TEC1-12703 Thermoelectric Cooler Cooling Plate Module 12V 3A. | ✹✹Total Size:40 x 40 x 4mm/1.6" x 1.6" x 0.16"(L*W*H). | ✹✹Vmax:15.5V;Qcmax:27W;Tmax(Qc=0):up to 60°C. | ✹✹they are Lightweight and durable，Suitable for manufacture in small size. | ✹✹Semiconductor coolers are a form of solid state cooling that incorporates both semiconductor technologies and electronic assembly techniques