Teswell Mini Universal 3.5mm In-Car Wireless FM Transmitter Audio Radio Adapter for iPhone 6S/6S Plus Samsung Galaxy S7 S6 Edge and other Smartphones Audio Players Stream music from any music player with 3.5mm audio port over your car stereo system to enjoy high quality audio experience Anti-static interference hands-free talking during driving, clear and convenient to adjust the tuning frequency Upgraded rechargeable battery provides up to 3.5 hours play time; Recharging takes 1 hour only It will shut off automatically to save the power when no music input for one minute With charging indicator for display charging status; Backed by 12-month warranty and 24/7 professional after-sale service