The ZMF TapNSet™ chess clock can be programmed with this app available for Android®. The app can be downloaded for free from the Play Store. Just enter the time settings that you want to use and tap the cellphone against the clock between the two LED indicators. Note that the time setting must be a valid one for the clock to receive it. For example, a time setting of 10 minutes for one player and zero minutes for the other won’t be accepted by the clock. When programming the ZMF TapNSet™ clock with a cellphone, the phone will vibrate and the clock’s LED indicators will momentarily blink to indicate that the operation was successful. The location of the NFC antenna in a cellphone can vary depending on model. The best way to find out where the antenna is located is to try tapping the cellphone against the clock using the bottom, middle, or top part of the phone until it connects.