Inquiry regarding the Power Consumption of "Power Over Ethernet" Injector

How much Power would a 18V “Power Over Ethernet Injector” consume per day in Electrical Units (i.e. kW-h) , if left on for 24 hours ?
Please , kindly can you show the working ? This product has been manufactured by Telenet Systems Pvt. Ltd.

The product’s .pdf file for the above product shows the following electrical specifications :

Ethernet Connectors :- RJ45 Jacks (2)
Ethernet Data Rate :- 10/100 Mbps Ethernet
No. of Ethernet Devices that can be powered :- Single
Data Lines :- Pair 1 : Pins 1/2
Pair 2 : Pins 3/6
Cat-5 Power (Poe) Pin Out (Spare Pair) :- +VDC: Pins 4/5
– VDC Pins 7/8
Operating Temperature :- 0 C to 50 C
Max Ouput Power :- 30W
Nominal Output Voltage :- 18V (Typical)
Input – 205-255 VAC 50 Hz
IEEE 802.3 af Compiant :- Not applicable

The Adaptor that I am using along with this Injector has the following Details printed on it :

AC/DC Adaptor
Input – 100-240V AC 50/60 Hz
Output 18 Volt = DC 1.67 Amp

I have been supplied the above Injector & Adaptor by “Tikona Digital Networks” to enable me to use their Wired Cable Broadband Connection on my p.c .

They have dropped their Cable from the Terrace of the 9 Floor Building where I live, to my Flat , which is on 7th Floor .

On the Cable that Tikona has provided , it is written as follows : “Duraconnect CAT -5e 4 Pair UTP 25 AWG UV Resistant PVC as per TIA/EIA 568 C.2 And IEC/ISO 11801” .

This Cable connects to the “Power Over Ethernet Injector” & from the LAN socket of this injector , another cable (with same thing written) runs to my P.C. & gets connected to it .

This is how I am able to use Tikona’s Cable Broadband connection .

In case I am wrong in assessing which Injector I am using & in case , I am actually using Telenet’s 12V Injector , in that case , what would be the Power consumption per day (if left on for 24 hours) ? The specifications of this product are as follows :

Maximum Output Power – 12W
Nominal Output Voltage – 12V (Typical)
Input – 205-255 VAC 50 Hz
IEEE 802.3af Compliant – Not Applicable