Dimension: 36x36mm(W*D), Cable connector: JST, Input voltage: 7V to 28V, Output power: 200/400mW/800mW/1600mW, Power supply: 5V camera @ under 500mA max., 6pin, Antenna connector: MMCX, Item name: Race Ranger, 30.5×30.5mm (hole), Weight: 16.81g (excluding antenna), Extra features: Smart audio 1600mW.
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Aliexpress
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Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in Europe 
. There’s only 1 record in my database, so I have no idea if the price is OK.
Link: Banggood product page
1. ($25.10): 2022ACTIESNL
2. ($25.37): BG00c906
coupon code has to be applied in shop’s cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BGCHRIS13, BGHYJ, 0e7f33, BGOTC21, FBCOUPON1, BGDYRY, Parts8, BGCuponation10, 13f142, BGDAVIS, 00c906, BGGAL8, BGJON8, BGRCParts8, ADMITAD2212, BG1efeb0, MVC8SPRING, 8BGwbg2204, 8wEbgaInS5, pROMo8cuPoN, BG8RCToy, BGRCT10, BGJUNEGSG9, BG8ReviTrage, Cuponation9, BGMatt2022, BGToys8
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – AKK Race Ranger Audio Switchable FPV Transmitter ($-3)
Price history and price alert
There is only one database record (it was for $19.99), so you can’t see price history chart.
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)).