Worked with android 4.3 and above version smart phone:
Samsung Galaxy S4, NOTE 3, LG NEXUS4 NEXUS5.
Also compatible with IOS system:
iPhone4S / 5, iPod Touch 5
the new iPad , iPad with Retina Display . iPad Mini

Package Include: 1 x Smartag Anti-Loss Device (Smartag), 1 x CR2032 Coin Battery and 1 x Quick user guide

Install Battery
a. Open Battery Cover by rotating 30 degrees in Counterclockwise to the unlock icon by a coin or other suitable tool , and then detach the battery cover from Smartag.
b. Insert the CR2032 into battery slot in the arrow’s direction, and then push CR2032 down into slot.
c. Close Battery Cover by rotating 30 degrees in clockwise, until the cover turn to the place.
 

Replace Battery
Open the battery cover and take out CR2032 by paper clip. Three Steps to SETUP
Step 1: Download and install Smartag APP.
Please search and download Smartag APP in the App Store or The Google Play Store
Step 2: Open the program and run it
On the screen of your Android phone or Apple device click "APP" smart application, then select "Bluetooth permission request." Then click the "Turn on the Bluetooth function."
Step 3: Pairing
Move Smartag nearby iPhone or Android phone, Press the Connect button (●) 3 seconds Paired with the iPhone or Android, with green LED flashing state. The APP will find Smartag , Come out a window “Pair Blue Tooth”please tap the "yes" to allow Smartag connection. Flashing green LED lights will turn off after Smartag is paired with an iPhone or Android.