Brand Name: oly2u Inlay material: None High-concerned chemical: None Origin: Mainland China CN: Zhejiang Metals Type: Stainless Steel Cladding Material: Others Gender: Men Compatibility: All Compatible Item Type: Rings Function: fitness tracker Model Number: Temperature ring Style: Punk Rings Type: Cocktail Ring Surface Width: 8mm Setting Type: None Material: Metal Shape\pattern: Letter Fine or Fashion: Fashion Occasion: Party Smart jewelry: Temperature sensing jewelry Temperature sensitive ring: Simple ring Smart ring: Temperature Test Finger Ring gold ring: black ring Notice: The ring temperature needs to be above 27 degrees to display the number