Data are physically removed from the USB port, cannot transfer data with this adapter. You can charge your device safely in public places. It is suitable for phone, tablet, MP3, and etc. Adopt premium aluminum alloy material for durable use. Suitable for hotel, airport, cafe, office, and etc. Description This is a USB data blocker. It is made of aluminum alloy material, durable to use. Physically removed data prevent any kinds of data transfer or sync so that you can charge your device safely with it in public places. size: 35 x 14.6 x 7mm Material: Aluminum alloy colour: black Package Contents: 5 x USB Data Blocker Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.