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Bluetooth is a short-range radio link intended to replace the cable(s) connecting portable and/or fixed electronic devices. Key features are robustness, low complexity, low power, and low cost. Bluetooth operates in the unlicensed ISM band at 2.4 GHz. A frequency hop transceiver is applied to combat interference and fading.. Although audio is bi-directional, each Bluetooth audio profile has two sides that are not interchangeable since one needs to be in control. The two roles are called the Audio Gateway (AG), and Headset (HS) or Hands-Free (HF).. Bluetooth uses radio waves for transmission. If you can create a directional radio wave device, and they do exist, you can create a directional bluetooth. You may wish to look at the electrical engineering stack exchange. This is not possible without different or modified hardware.. At the lowest level Bluetooth devices both send and receive data - they need to acknowledge connections and data transfers. Whether a tap on a bracelet can initiate an action on the phone depends on the software in the phone and the device.. Read and clear trouble codes as well as bi-directional functionality 3. Autel Diagnostic Analysis System MaxiDAS DS808K with Full Connect Kit (Upgraded Version of DS808, DS708) Automotive OE-Level OBD2 Code Scanner Support Autel Maxisys Elite Diagnostic Tool (Upgraded Version of MS908P Pro) with WiFi Bluetooth Full OBD2 Automotive. : Bi Directional Scan Tool. From The Community. Try Prime All Launch X431 Pro Mini WiFi/Bluetooth Professional X-431 Diagnostic tool ,CODE, DIAGNOSE, SERVICE,2 Year Free Update Online. by LAUNCH. $789.00 $ 789 00 Prime. FREE Shipping on eligible orders. 4.6 out of 5 stars 40.. DHM 4 Series Bi-Directional Digital Hydraulic Multimeter with Bluetooth $ 3,925.00 – $ 4,878.00 The DHM 4 Series Digital Hydraulic Multimeter is an all-in-one unit designed to test the performance of hydraulic pumps, motors, valves and hydrostatic transmissions with the added benefit of Bluetooth functionality..