Specifications:
Color: Black
Material: ABS + PU
Pedometer sensor:3D sensor
Power source: CR2032
Water resistance: 30 meters
Backlight display: EL
Transmission mode:wireless 5.3K Hz with chest belt
Watch dial case diameter: 4.4cm / 1.7in
Band width: 2cm / 0.8in
Watch weight: 53g / 1.86oz
Chest belt weight: 59g / 2.1oz
Package size: 11.4 * 8.5 * 7.5cm / 4.5 * 3.3 * 3in
Package weight: 158g / 5.62oz

Package List:
1 * Heart Rate Monitor
1 * Adjustable Chest Strap
1 * User Manual (English)

Note: 
It is  to NOT wear the watch during swimming or taking shower.