The Oregon Scientific SE233 Vibra Trainer Elite heart rate monitor kit is a sleek and durable device designed for both indoor and outdoor use. Its black plastic construction and compact display make it perfect for unisex adults looking to track their heart rate during gym and training sessions. With a battery life of more than 7 days and compatibility with Android operating systems, this heart rate monitor provides accurate measurements and convenient features for a variety of activities. The wrist-mounted design and English language interface make it easy to use and efficient for anyone looking to monitor their heart rate effectively. ** Need a new battery. Battery is NOT included.***