How to set the ringtone？

1. Short Press the Backward or Forward Button to select your favorite music. 2. Long Press the Volume Button for 8s, until it makes a One Ding sound with LED flash. 3. Press the button within 8s, then it will make a Two Ding sound with LED flash.

How to change the battery？

Replacing the transmitter battery is a very simple procedure. Simply insert the small screwdriver supplied through the small opening at the bottom of the transmitter in a 45° and pry it open.

How do you adjust the volume?

Press the volume button on the receiver to adjust volume, there are 5 levels in total, the default is the maximum sound, press once to change one level cycle in turn.

Manufacturer	SURFOU
Part Number	1
Item Weight	10 ounces
Product Dimensions	2 x 2 x 2 inches
Item model number	N128
Batteries	1 12V batteries required. (included)
Is Discontinued By Manufacturer	No
Size	1 Button + 3 Receivers
Color	black
Style	3 Receivers + 1 Buttons
Power Source	Battery Powered
Installation Method	Adhesive or screw-in (transmitter)
Item Package Quantity	1
Sound Level	110 dB
Coverage	‎Ultra-long 1300 feet wireless coverage
Mounting Type	1
Plug Format	A- US style
Special Features	Waterproof
Included Components	3 x plug-in receivers, 1 x push button, 1 x door sign, 1 x 12V23A battery, 1 x screwdriver, 2 x dowels, 2 x double-sided adhesive tape, 1 x instruction manual
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Average Battery Life	3 years

SURFOU

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