GARMIN Edge 810 cycle computer with training mode, approximately 2.5 inches. This is the body only. Operation has been confirmed, but I am not familiar with the operation, so I do not know the details. Please understand that after purchase, no returns or refunds will be accepted. Thank you for your understanding. - Brand: GARMIN - Model Name: Edge 810 - Connectivity: USB port - Screen Size: Approximately 2.5 inches - Features: Training mode - Condition: Used Thank you for viewing.