SPECIFICATION Power Supply: 3.3V~5V Static Current: 1mA IO Continuous Driving Current: 15mA Communication: I2C I2C Address: 0x20-0x3F(The module occupies I2C address of 0x20-0x3F and cannot work with I2C device in this address range.) Operating Temperature Range: -20℃~80℃ Size: 45*37mm/1.78*1.46”
Wiki - https://wiki.dfrobot.com/SKU_DFR0979_Gravity_CH423_I2C_24_Digital_IO_Expansion_Module
SHIPPING LIST Gravity: CH423 I2C 24 Digital IO Expansion Module x1 Gravity-4P I2C/UART Sensor cable x1