PAM8403 2.5-5v Super mini digital power amplifier board
SIM900 Module GSM GPRS Shield expansion board wireless module Function more than TC35i for Arduino
You can add GSM/ GPRS connection feature to your Arduino projects with GPRS Shield. You can use functions as dialing number and sending SMS easily with AT commands. To communicate between module and Arduino you can use Arduino's hardware serial port or software serial port which can be defined by Software Serial library.
HCF4093 Quad 2 Input Nand Schmitt Trigger
Raspberry Pi 4 5v 3A USB-C Power Supply UK Plug white