The protective sleeve features fine workmanship, which can be used for a long time. The protective sleeve can keep your stopwatch from impact, water and dust. Made of silicone, the protective sleeve is eco-friendly and durable to use. The length of the protective sleeve is 85.3mm, width is 52.4mm and height is 16.7mm. The protective sleeve is compatible with Bryton-Rider 430 and compatible with Bryton-Rider 320. Item Name: Protective Sleeve Material: Silicone Applicable Model: Compatible with Bryton-Rider 430, Compatible with Bryton-Rider 320 Features: Shock-proof, Wear-resistant, Lightweight Size Details: 8.53cm x 5.24cm x 1.67cm/3.36" x 2.06" x 0.66" (Approx.) Notes: Due to the light and the screen setting difference, the item's color may slightly differs from the pictures. Please allow slight dimension difference due to the manual measurement. Package Includes: 1 x Protective Sleeve(Others Not Included)