Multifunction digital wristwatch with chronograph function. I received this a few years ago. I haven't confirmed that it works. It's battery-powered. Please purchase only if you understand this. No box or warranty - Model name: CHALLENGE - Color: Black I have kept it with care, but I am selling it to organize my belongings. I hope to sell it to someone who understands that it has been stored at home. Thank you for looking (^^)