How much does this cost to the nearest dollar?

Chronos Wearable Watch Disc for iPhone 5, 6, 7, 8, X using iOS 9.0 & Up - Stainless Steel
Love your Watch but wish it could do more? now you can with Chronos. The Chronos disc attaches to the back of your beautiful traditional Watch, turning it into your beautiful smart Watch. Chronos adds step tracking, and alerts for incoming calls, texts & app notifications. Tap your Watch to Silence incoming calls, find your phone, take a photo, control your music, and more. Chronos discreetly attaches to the back of your beautiful traditional watch, turning it into your beautiful smart watch. Chronos track steps and calories burned. Adorn your wrist with your watch, not a plastic step tracker or a bulky Smartwatch

Price is $16.00

Price: $15.74