BoxWave Polar M400 DirectSync Cable 2-Pack - 2 Convenient USB to Micro USB Charge and Sync Cables - Value Bundle! Synchronizes and charges your Polar M400 Supports Hi-Speed USB 2.0 data transfers! Compatible with VersaCharger PRO, Standard Car Chargers and Wall Chargers Durable, shielded cable Flexible strain reliefs on both connector ends