Miccus Mini-jack AX4 - Bluetooth Receiver with AUTOMATIC On/Off from USB, hands-free calling, add wireless audio to vehicles, speakers, stereos, etc. (Dual-Link) SIMPLE - One button push turns any speaker system or vehicle audio into a Bluetooth wireless connection. COMPATIBLE - Pair with phones, tablets, PC s or Bluetooth transmitters such as the Miccus Home RTX. FLEXIBLE - The patented swivel-jack design allows for tight connections and minimal visibility. AUTO ON/OFF FROM USB - Apply USB power and automatically re-connect to the last paired device. SUPPORT - Access to reliable US-based phone support M-F, 11am-4pm EST. Email support available 24hrs.