The DAddario Equinox rechargeable tuner is all you need to keep a multitude of stringed instruments performing to their best. Easy to use and with a minimum of fuss this handy chromatic tuner clips onto your equipment and swivels to whatever angle you need. It works by reading vibrations rather than sound ensuring pinpoint accuracy and rapid speed for your tunings thanks to DAddarios excellent processor. Whats more is that youll never have to bother with finding replacement batteries as the Equinox comes installed with a rechargeable battery and a provided USB-B cable allowing up to 24 hours of use. At an affordable price and with no compromise on features the Equinox is a must have for any performing musician or players that want to experiment with different tunings. Please Note: Contains unsecured button batteries which can be harmful if swallowed. Keep out of the reach of children. Specifications Product Code: Model: DAddario Equinox Rechargeable Tuner Colour: Black Battery: Rechargeable internal battery Charger Included: Yes Charger Type: USB-B Tuning Frequency: 420-450hz