With the Sandberg Wireless Charger Marble Stone, you get a unique and exclusive wireless charger made from genuine natural marble. No two stones are alike. The coil for wireless energy transfer is embedded in the stone, which retains its natural shape and structure. The smartphone is cooled while charging, further optimizing the charging speed. The charger in the stone is connected via a USB port with a color-matched cable. It supports Qi-compatible smartphones.