Sparrow and Wren (ASUS ZenWatch 2) are rectangular watches. The two differ in size, wren being smaller, while sparrow is larger and adds a speaker. The ports are very complete and polished.

Description

sparrow — Asus Zenwatch 2
Status	supported
Stars
Status details
Display	good
Touch	good
Bluetooth	good
Haptics	good
Tilt to wake	good
Light sensor	missing
Always-on display	good
Dual display	missing
Microphone	good
Speaker	good
Compass	missing
Steps	bad
Heart rate	missing
USB	good
WLAN	good
GPS	missing
NFC	missing
Cellular	missing
Camera	missing
Crown	missing
Hands	missing

Sparrow and wren are rectangular watches with rounded corners and a power button on the right side. The display is a flat 1.63" OLED with 320px resolution on sparrow, and 1.45" OLED with a low 280px resolution on Wren. Both are protected by 2.5D curved Corning Gorilla Glass 3. Sparrow takes 22mm straps, while wren takes 18mm straps.

Repair and customization

The back of the watches is held on by screws, so repairs are easy. Parts are commonly available. The display is usually shipped including the metal casing. You will likely need to replace the battery when buying these watches as they are getting quite old.

The magnetic USB cable does not hold on to the watch and thus the contacts very well. Here is a 3D printed cradle that helps laying wren and sparrow onto a flat surface while keeping the USB cable attached:

https://www.printables.com/model/647241-flat-surface-mountcradle-for-asus-zenwatch-2-wi501

Miscellaneous hardware docs

Manually getting to fastboot

During the first seconds of the boot process, swipe diagonally across the screen. Starting from the top/left outer edge of the screen to the bottom/right.