Built-in microphone for acoustic guitars Auto and manual tuning modes High contrast LCD display provides improved visibility Quick and easy tuning makes it ideal for stage performances Useful flat/sharp tuning modes This tuner not only has the standard flat tuning mode, but also has the SEIKO original sharp tuning mode, which is helpful when using capotastos. Long battery life of approx. 145 hours (with manganese dioxide batteries) / approx. 300 hours (with alkaline batteries) Provides precise tuning with digital cent indications