What’s inside: Fitbit Charge HR

Fitbit’s Charge HR is a step-counting band with a round-the-clock heart-rate tracker. The device tracks sleep at night, exercise during the day, and active heart-rate levels when resting or working out with the ability to sync to just about every major smartphone and computer available.

At 204.4 mm x 21.3 mm x 12.7 mm, the Fitbit Charge HR is equipped with a 0.7-in OLED, monochrome display screen. It has a STMicroelectronics STM32L151RD ARMBased 32-Bit microcontroller and 512 KB of serial flash memory. Its sensors include two 3-axis accelerometers, a MEMS micro altimeter module, and an optical heart rate sensor. 

The device features caller ID, automatic exercise recognition, silent alarms, wireless sync, and is water resistant. It has a 3.7 V Li-Polymer battery that lasts up to five days before requiring a charge. Connectivity options include Bluetooth 4.0. The Fitbit Charge HR comes in black, plum, blue, teal, and tangerine, with the screen matching the color of the band.

The full teardown report can be found here.