BT-Fun - ShopHere you can buy the hardware of the BT-FUN system. Currently, we are offering only the 'BT-TENS1', a one-channel TENS system. Other devices will follow shortly. Please note, you need to get the BT-FUN app in order to control your device. The app can be found in the app store. You will find the link to the app store here. In case, you have a voucher, please enter the code below. Otherwise, simply leave the field empty. For shipment within the European Union, we need to charge the German VAT (19%, already included in the price below), for shipment outside the European Union, VAT will be excluded.