Quick overview from the supplier:
Apple AirTag (4 pack) A2187, MX542
Length Range: 20-107 cm, 7 section stainless steel rods. Product Net Weight: 165 g. Maximum Load: 500 g. Battery Capacity: 45 mAh. Charging Voltage: 5V. Charging Time: 1 Hour. Stand-By Time: >100 Hours.
