Sync:Bluetooth 4.0 wireless technology allows automatic wireless syncing to over 120 smartphones
Also syncs to computers and tablets
Syncing Distance:  20.0' (6.1 m)
Transceiver:Bluetooth 4.0
Water Resistance: Water-resistant to 1 ATM
Memory:  Tracks 7 days of motion data - minute by minute
Tracks daily totals for past 30 days
Display:   OLED
MaterialsWristband:       flexible, durable elastomer material
Clasp:           surgical-grade stainless steel
Battery Type:  Lithium-polymer
Battery Life:Up to 7 - 10 days
Charge Time:  1 - 2 hours
System Requirements:  Windows: Windows Vista and later
Mac:          Mac OS X 10.6 and up
Internet connection
USB port
Operating Temperature:     -4 to 113° F (-20 to 45° C)
Operating Altitude:30,000' (9,144 m)
SizeFits wrists:        5.5 - 6.5" (14.0 - 16.5 cm)
Width of band:         0.8" (2.1 cm)
Weight:   Not specified by manufacturer
Packaging Info
Package Weight:0.3 lb
Box Dimensions (LxWxH)7.8 x 2.8 x 2.8"