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In The Boy Next Door, Jennifer Lopez wears a Nike+ Sport watch. This watch is available for around $200 brand new and is used for running as it can monitor your heart’s BPM and other activities such as calories burned.
The watch is featured in a scene where JLo goes jogging. She also wears the Nike armband which is used to track your running progress and sync your running data to the Nike+ Sport watch. This watch is under the model number: WM0070-100.