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Xiaomi Mi Band

2014–2015 · wearable

Specifications

Cpu: Dialog DA14580 Bluetooth SoC (ARM Cortex-M0 core) with a separate accelerometer for step counting
Battery: 41 mAh, rated 20-30 days per charge; charges via a proprietary 2-pin magnetic dock (no cable in early units)
Display: None (single status LED only, no screen)
Storage: base: Onboard flash for firmware and step/sleep logs (capacity not publicly specified by Xiaomi) · options:
Case Sizes: One size, adjustable rubber strap
Os Support: latest: Mi Fit app continued to add support for later Android/iOS versions until Xiaomi discontinued updates for this first-generation band · shipped: Mi Fit app, Android 4.4+ and iOS 7+
Release Price: 79 CNY (about $13 USD at launch)

Variants

Colors

Standard blackOnly strap color sold at launch; the pill-shaped tracker module was interchangeable across straps.

Upgrade paths

other

Swap the tracker capsule into third-party or replacement straps · The tracker module snaps out of its rubber strap, so a huge market of cheap aftermarket straps (including metal and leather ones) sprang up around it.

~$3

EASY

other

Community-reverse-engineered firmware and BLE protocol · Because the official app and cloud sync were limited, hobbyists reverse engineered the Bluetooth LE protocol to build alternative apps and unofficial firmware, one of the most-hacked fitness trackers of its era.

free

HARD

battery

Sealed 41 mAh cell, no user replacement path · Battery is sealed inside the capsule; the device was cheap enough that users typically replaced the whole unit rather than repairing it.

n/a

LOCKED