samsung galaxy a56 5g binfen faux leather flip case with rfid blocking purple PIM_CategoryId_3125 Frequency: 25Hz 20KHz you can hear both Frequency: 25Hz 20KHz Choose the EIDERWOOD Rugged Case for advanced protection so you don't risk having your card information stolen and misused while it's in the cardholder Inside the flip case is a regular back case – the part where you attach your phone – and it's made from a flexible plastic material that makes it easy to put on and take off the case