The PitchGrabber mobile tuning pickup easily and safely clamps on to virtually any musical instrument and captures the pitch using its piezo pickup sending it directly to your mobile tuning application. It uses the headphone/mic input of your mobile device (3.5mm plug) to completely isolate the sound of your instrument and provide a direct input path to your tuning application. The 8' long, fabric wrapped cord permits free movement and also allows tangle-free use with larger instruments. Perfect for noisy environments. No batteries required.