iPhone running iOS 9.2 and above 

or

Android phone with Google Play running 7.0 Nougat and above

Bluetooth 4.0 capability required

Type: Rechargeable Lithium Polymer

Capacity: 400mAh

Battery life in use

• Without backlight: 30 hours
  
  
• With backlight: 10 hours
  
  
• Blended: 20 hours

Battery life in standby: 4-6 months

Charging: USB-A charger with pogo pin interface

• Screen technology: Memory in Pixel transflective LCD with LED backlight
  
  
• Resolution: 208 x 208, 287 PPI
  
  
• Active area diameter: 26mm (1 inch)
  
  
• Bonded toughened glass

• Accelerometer
  
  
• Gyroscope
  
  
• Magnetometer 

• ABS plastic
  
  
• TPU
  
  
• Silicone rubber
  
  
• Toughened bonded glass

4 x physical buttons

Water and particle resistance

IP67 rated

49.8mm (1.96 inches) diameter, 18.6mm (0.73 inches) deep

30 grams (1 oz)