San Mateo, Calif.-based Tile, maker of a bluetooth-powered wearable device to keep track of items, announced it has raised a $3 million Series A extension from Khosla Ventures. Tile previoulsy raised $13 million in funding, including a $9.5 million Series A round led by GGV Capital and $3.5 million in seed-stage funding led by the large Chinese company Tencent. Other investors include Tandem Capital, Rothenberg Ventures and individuals. Tile said it has shipped 2 million of its tracking devices. The company raised $2.6 million via its Selfstarter campaign in 2013.