But they come with their own little USB adapters. Lol. dont trust any computer without bluetooth built-in from default, this is like asking if you want a notebook without wi-fi. Bluettoh mouses have the advantage that they dont use 1 USB port, as bluetooth is a hidden antena within the notebook.
Definition of arkose. : a sandstone characterized by feldspar fragments that is derived from granite or gneiss which has disintegrated rapidly.
Arkose usually contains small amounts of calcite cement, which causes it to 'fizz' slightly in dilute hydrochloric acid; sometimes the cement also contains iron oxide. Arkose is typically grey to reddish in colour.