Hw21 bluetooth fitness smart watch

model: hw21
body dimension: diameter=42mm, thickness=9.2mm
band dimension: width=20mm，unfolded length 248mm
weight: 40g (including band)
material: metal + abs + rubber
display: 1.28inch tft screen
definition: 240 x 240 pixels
battery capacity: 200mah
charge: magnetic charging cable
bluetooth version: bluetooth v5.0
sensor: ppg bio heart rate, g-sensor
waterproof & dustproof: ip68
operation temperature: -20℃~45℃