Bluetooth Hands-free Speaker: Let you never miss a call while driving. Built-in 3W speaker for hands-free answering to ensure safe driving without violating traffic rulesVoice Control: Double click the button M to activate Siri or Google Assistant, then give voice commands to control the car Bluetooth speaker, such as making calls or playing musicEasy to Use: Just clip it to the car sun visor and connect it with your phone via Bluetooth. Supports connecting to 2 mobile phones. Magnetic-clip design allows you to remove the speaker anytime easilySupport TF Card: Built-in TF card slot, you can insert your TF card to play music to eliminate fatigue. We provide 18 months warranty service and welcome any suggestion you have for the Bluetooth car speakerphoneClear Loud Sound: With Noise Reduction and Echo Cancellation technology, it brings you a clear call experience. Long press the button +/- to increase or decrease the volume. Tip: Keep your phone away from the Bluetooth car speaker while on a call