This is a car charger with an LED display (cycles through Temperature, Amps, and Volts) on sale for $ 3.99. I normally see this charger for around $ 10-$ 15. Just use the promo code at checkout.

Promo code at checkout AY6QKH2H

Original Price: $ 9.99
With Code: $ 3.99

Click Here To Buy On Amazon [amazon.com]

Features From Their Page:

FAST DUAL USB CHARGING PORTS – Combined 3.1 amps; 10W; uses smart technology to ensure each device pulls the right amperage. Charger is powered by the vehicle’s cigarette lighter. Equipped with Over-charge Protection. (Auto power off when input/output is greater than safety current, protects against over-heat, over-current and over-charging.)

LED DISPLAY – LED digital luminescence tubes; Display cycles between internal temperature (Fahrenheit), device’s charging current, and the voltage of the vehicle’s car battery. The LEDs are bright enough to read the display without being a distraction while driving. (Does not display temperature while charging)

Compatible with iPhone 6, 6 Plus, 5s, 5c, 4s, 4, iPods, iPad, Samsung Galaxy Note 2, Note 3, S2 S3, S4, S5, HTC One, LG G3, Most Android/Windows Smart Cell Phones, GPS, Tablets, and Other USB-charged Devices

SPECIFICATIONS – Input: DC 12V – 24V; Output: DC 5V/3.1A; 10 W; Conversion efficiency 95%; Measuring range: Voltage 5V-25V; Current 0 – 3.1A; Temperature -4⁰ to 176⁰ F

Backed with a 1 year, No-Hassle, Free replacement Warranty