These cases can be used to store TF / CF card. Each slot of this memory card holder fits the card strictly and perfectly. The ergonomic locking system keeps the memory card holder securely. Notes: 1. The Memory cards reader function supports computers and the devices with OTG function, but the app-les Phones are not included. 2. Before you start to read the card, please double check your device’s setting and make sure the OTG function is on. Specification:  Material: ABS, PC, TPV Model No.: PU5001, PU5002, PU5004(optional) Storage Capacity:     PU5001: 3SIM'2XQD'2CF'2TF'2SD    PU5002: 4CF'8SD'9TF'1Card PIN'1Standard SIM'2Micro SIM'2Nano Sim    PU5004: 1Standard SIM'2Micro SIM'2Nano Sim'3CF'7SD'6TF'1Card PIN Read Card: TF / CF USB Type: 3.0 Cable Length: 40cm / 15.75in Item size:    PU5001: 7.3 * 5.9 * 2.6cm / 2.87 * 2.32 * 1.02in    PU5002: 11.5 * 7 * 2.1cm / 4.43 * 2.76 * 0.83in    PU5004: 11.5 * 7 * 2.1cm / 4.43 * 2.76 * 0.83in Item weight:    PU5001: 68g / 2.40oz    PU5002: 129g / 4.55oz    PU5004: 205g / 7.23oz Package size: 13 * 8 * 3cm / 5.12 * 3.15 * 1.18in Package weight:    PU5001: 98g / 3.46oz    PU5002: 130g / 4.56oz    PU5004: 230g / 8.11oz Packing Included: PU5001: 1 * Case PU5002: 1 * Card Pin 1 * Case PU5004: 1 * Card Pin 1 * Cable 1 * Case