# K121971: Withings, Smart Body Scale

- Pathway: 510(k) (Special)
- Applicant: Zhongshan Transtek Electronics Co., Ltd.
- Decided: Sep 27, 2012 after 84 days
- Product code: MNW (Analyzer, Body Composition)
- Device class: 2
- Regulation: 21 CFR 870.2770
- Recalls of this device: none
- Data: FDA decisions to Oct 25, 2026; recalls to Oct 12, 2026

## Lineage
Longest line of descent: 5 generations back to K930599 (1994). 5 ancestors in all.
1 later device descends from it; 1 cites it directly.
0 of 7 devices in its family (counting itself) have a Class I recall.

## Predicates on the family tree (from the FDA summary)
- K102191: Transtek Glass Body Analyzer; Transtek Glass Body Analyzer; Transtek Glass Body Analyzer;Transtek Glass Body Analyzer, Zhongshan Transtek Electronics Co., Ltd. (2011) Summary page 1.

## Most influential descendants
- K133872: Aria Wifi Smart Scale (2014), 0 descendants of its own

## Indications for use
The Withings WBSO1 Smart Body Scale is a body analyzer that measures weight and uses bioelectrical impedance analysis (BIA) technology to estimate body fat mass in generally healthy adults 18 years of age or older. It is intended for use in the home/domestic setting only.

Source page: https://510kreport.com/device/K121971
Methodology: https://510kreport.com/methodology