Excellent condition, very well taken care of. Aluminum Finish Gold Features GPS, GLONASS, Galileo, and QZSS Barometric altimeter Water resistant 50 meters1 Electrical heart sensor Optical heart sensor Improved accelerometer up to 32 g-forces Improved gyroscope Ambient light sensor Speaker 50 percent louder Microphone Apple Pay GymKit Capacity 16GB Ceramic and sapphire crystal back Display 40mm 324 by 394 pixels 759 sq mm display area LTPO OLED Retina display with Force Touch 1000 nits brightness Chip S4 with 64-bit dual-core processor Up to 2x faster processor W3 Apple wireless chip Connectivity LTE and UMTS2 GPS + Cellular models Wi-Fi 802.11b/g/n 2.4GHz Bluetooth 5.0 Power Built-in rechargeable lithium-ion battery Up to 18 hours3 Magnetic charging cable USB power adapter Aluminum - 40mm Height: 40mm Width: 34mm Depth: 10.7mm Case Weight: 30.1g Wireless service plan required for cellular service. Apple Watch and iPhone service provider must be the same. Not available with all service providers. Not all service providers support enterprise accounts or prepaid plans; check with your employer and service provider. Some legacy plans may not be compatible. Roaming is not available. Contact your service provider for more details. Apple Watch Series 4 (GPS + Cellular) requires an iPhone 6 or later with iOS 12 or later. Apple Watch Series 4 (GPS) requires an iPhone 5s or later with iOS 12 or later.