Princeton Tec Sync HeadlampPrinceton Tec Sync Headlamp PRODUCT DESCRIPTION The Syncs claim to fame Simplicity. Intuitively cycle through modes using the large dial on the side and skip button pressing sequences a must for tasks where you need to control modes on the fly, like running, and places where thick gloves are a must. The Sync is one of the newer members of The Family Series of headlamps: when developing the Sync we started with the proven foundation of our stable