Functions as for CM 4.21 but with additional heart rate functions Heart rate monitor functions (current/average/maximum) Programmable heart rate limit (upper and lower limit) Calculated optimal training zone using ClCLOlnZone ® Exercise times above within or below your targeted heart rate range Calories burnt (current/total) Additional functions Time 12/24h display Date Power down mode Optional extras PC configurable PC-Analysis Cadence function (current/average/maximum) Delivery scope Twist Klick handlebar bracket, transmitter, spoke magnet, transmitter belt including elastic strap, mounting materials. Optional: wrist band (for jogging computer use)