Luis Jiménez Sep 8, 2025
In the past, tag locators compatible with Google Find Hub (aka Find My Device) were only available from a bunch of manufacturers and were somehow expensive (~25€), but in the last months I've seen some cheap tags on Aliexpress by RSH (under 4€).
#electronics #FindHub
Show threadLuis Jiménez Sep 8, 2025

They are known as RSH iTag13 or LocaTag (that's the name shown in Find Hub app)

This is a short promotional video https://www.youtube.com/watch?v=h05C2zJadaA

RSH-itag13-Google, Android Tag Google Find My Device, Key Finder Locator Wallet Luggage Tracker

YouTube
Show threadLuis Jiménez Sep 8, 2025

I have disassembled one of them to make a quick analysis of its main components:

This is the PCB out of the two-part encloser with the battery still attached.

Show threadLuis Jiménez Sep 8, 2025
This is one side of the PCB with the battery holder, on/off button and buzzer.
Show threadLuis Jiménez 
The design is based on the ST17H65B-PP chip by Lenze Technology.
It's ARM® Cortex™-M0 with 512 KB Flash and 64 KB SRAM compatible with Bluetooth LE 5.2 designed to be applied on the devices with Google's Find Hub. In fact, it's listed as certified for Google Find Hub Network.
The design seems compatible with the sample application described in the chip datasheet. It uses an internal DC/DC to minimize power consumption.
Sep 8, 2025 at 6:08pmWeb
Show threadLuis Jiménez Sep 8, 2025
As a summary, the design includes:
• BLE microcontroller
• 16 MHz crystal for the microcontroller.
• Chip antenna
• DC/DC external passive components
• Buzzer (probably driven from Q1 bipolar)
• Pushbutton used for ON/OFF
• A couple not-assembled ICs. My guess is that U3 footprint might belong to an IMU sensor.
Show threadLuis Jiménez Sep 8, 2025
• Several test points for debug. (GND, 3V3, RST, P9 and P10). I initially thought P9 and P10 would be SWD IO and clock, but they are connected to pins 8 and 9, instead of pins 3 and 4, where SWD pins are located according to the datasheet. In a different reference design, they are labeled as TX and RX.
• PCB is labeled as iTag13-RSH V3-20250417. It's a very recent design.
Show threadLuis Jiménez Sep 8, 2025
I wanted to know it's power consumption so I connected it to my Nordic Power Profiler Kit II. During normal operation the average power consumption is 21 μA.
Show threadLuis Jiménez Sep 8, 2025
Each of those peaks sent every 1s correspond to the transmission of an advertising BLE package over the three advertising channels.
The idle power consumption between peaks is ~4.6 μA, that is similar to declared 4 μA declared in the datasheet for sleep consumption with all SRAM retention.
Show threadLuis Jiménez Sep 8, 2025

Several links:
Lenze Tech Google Find Hub solutions: https://www.lenzetech.com/en/googleFindHub
ST17H65 Datasheet: https://www.lenzetech.com/public/store/pdf/jsggs/ST17H65_BLE_SoC_Datasheet_v1.1.5.pdf
ST17H65 schematic: https://www.lenzetech.com/public/store/pdf/jsck/SCH-ST17H65-V1.pdf

#electronics #FindHub #RSH #LocaTag #iTag13 #teardown

Google's Find Hub Device

Google’s Find Hub Device helps you find your belongings quickly and safely – even when your devices are offline or far away. From your misplaced car keys to the tablet hiding beneath your couch cushions, it’s easier than ever to keep track of your items. Plus, all of your location information remains private – even from Google.