Screen size: 2.1 inches, black, white
And red, LED light: 7 colors
Product size: 73*36* 14mm
Display: 48.55* 23.7mm
Screen size: 2.66 inches, black, white
And red, LED light: 7 colors
Product size 87 * 43 *13 mm
Display: 31*60mm
Battery life: 8 years (3 updates/day),
Replaceabl
Screen size: 2.9 inches, black, white
And red, LED light: 7 colors
Product size: 103*43* 13mm
Display: 67* 29mm
Battery: CR2450*2
Battery life: 8 years (3 updates/day),
Replaceable
Screen size: 4.2 inches, black, white
And red, LED light: 7 colors
Product size: 99 * 93.5 * 13.5mm
Display: 84.80 * 63.60 mm
Battery: CR2450*4
Battery life: 8 years (3 updates/day),
Replaceable
NFC: Supported