https://www.theverge.com/circuitbreaker/2018/4/11/17226846/motorola-releases-cheapest-moto-mod-stereo-speaker

Motorola has just released a new Moto Mod stereo speaker and it’s the cheapest speaker mod yet at $59.99. Still, it has most of the features of the more expensive Moto Mod speaker, with a built-in kickstand and dual 28mm stereo speakers inside the mod.

Since the Moto Mod connects to Moto Z phones, it relies on the phone as a source of power and doesn’t have a separate charging method.