GOLFZON SwingTalk Golf- SWT v1 SwingTalk is the most innovative golf swing analyzer that supports both iOS & Android devices. SwingTalk works for most of the smart phones, but we recommend iOS above 9.0 and Android above 4.4. Track club & shaft trajectory, shaft angle, actual movement of shaft and more. Please note that SwingTalk needs to have an impact for it to analyze the swing, so you may use any balls or a duffle bag when practicing. SwingTalk is connected to your smart phone using the bluetooth. SwingTalk can be used without any wires. The state-of-the art technology, sleek design and feather-like weight: Only 0.3 oz. SwingTalk is installed at the end of your club's grip. SwingTalk's pin should be in the grip completely without a gap. Don't pause your swing practice! SwingTalk brings you instant voice feedback of tempo & speed. SwingTalk is the only device with instant voice feedback function.