Secugen EA4-1006BLE Unity 20 Bluetooth (HU20-ASF-BT2-BLE).  Supports BLE - Works with Andorid, Windows, and iOS.  This is the correct BT Unity 20 for notary use. 

All-in-one fingerprint system with FMS, Bluetooth, LEDs, multi-funcial power button, micro-USB rechargeable battery  
Unity 20 Bluetooth is the world’s first elegantly designed, low cost, fully programmable Bluetooth fingerprint reader. Featuring a sleek wireless design with a premium FBI certified fingerprint sensor, the Unity 20 Bluetooth can securely transfer fingerprint data wirelessly to mobile devices for convenient biometric authentication, identification and enrollment. 
Unity 20 Bluetooth can be used together with an Apple iOS or Android mobile device (such as iPhone, iPad, smartphone or tablet) to scan, enroll, and authenticate users without the need for cables or OTG adapters. The reader is built with the industry’s most rugged and patented optical fingerprint technology and yet is small enough to be carried in a pocket and held comfortably in one hand. It can also be used on the desktop with Bluetooth-enabled computers. Thoughtfully designed, the device works in either direction, so you scan your finger or another person’s finger without having to turn the device around. 

The SecuGen Unity 20 Bluetooth (EA4-1006BLE) is compatible with NotaryAct, the electronic notary journal app used by California notaries to satisfy the thumbprint requirement under Government Code § 8206. NotaryAct captures the fingerprint scan directly into the journal entry via Bluetooth — no ink, no smudging, fully compliant digital record stored in the cloud.