USB Output: QC3.0+5V1A+PD(20W) Fast Charger, Colorful light: Green /Blue /Red /Yellow /Light blue /Purple /White /7 color cycles, FM Frequency: 87.5-108.0MHz, Dual USB Output: 5V 3.1A/5V 1A, Bluetooth version Bluetooth 5.0, Limited voltage: 9-30V, Feature: Support U Disk/TF card/SD card playback music, Combination: Bluetooth-Enabled / USB Port, Play Format: MP3/WAV, Working Voltage: 12-24V.
Go down and check coupons out. Remember to check price history if it is available. Let’s see what best price is ATM.
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China. We have found one coupon for this product!
Link: Banggood product page
1. ($15.97): BG00c906
you should apply the coupon in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): Cuponation9
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Here is price history (for all/most countries) for Dual Display QC3.0 PD20W FM Bluetooth Transmitter Charger. The lowest price was: $12.99.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).