USB voltmeter ammeter voltageTC66 and TC66C difference: TC66 does not have Bluetooth board, does not support APP. TC66C . Because the firmware is constantly updating, please refer to the actual products received. When using TC66 to detect the charger, it is necessary to turn on the CC drop-down menu. When using TC66 to detect the charging process of the mobile phone, it is necessary to turn off the CC drop-down menu. The ON switch of the product is the system power switch. When in use, set it to ON. If the voltage is lower than 3.5V, use Micro- to supply power independently and set the switch to OFF. When TC66 USES the double-headed Typec line for decoy trigger operation, only one side can be used. If it is not, please return the interface. Color: Black Material: Metal Package Contents: 2 * TC66 Type-C PD Trigger Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the