Armband for iPhone (iPhone 3GS or iPhone 4) AND Sensor Case to hold Nike+iPod Sport Kit Sensor (does not include actual sensor) This bundle includes a Sport Armband for iPhone AND a Sensor Case to hold the Nike+iPod Sport Kit Sensor Sensor case securely attaches around shoe laces to hold Nike + iPod Sport Kit Sensor (sold separately) Armband has a cord flap to securely store and manage the earphone cord Armband has clear, protective window cover with full navigational control Comfortable and flexible armband adjusts to fit arms 9" to 17" and an Armband Extender is available for larger arm sizes (see EX3); Reflective logo for nighttime safety