According to the instructions there should be a suction device for attaching this to glass . There isn't one . You have to buy them separately . The one's I looked at have bad reviews in that they don't stick the speaker to glass - the speaker falls off . Not good news . The speaker itself is small and quite heavy for it's size. It is , however , a good little speaker on the correct surface . It's fairly basey for what it is . It charges through USB . Could do with a longer cable . This does not operate with Bluetooth .