Wide Voltage: 8~28V, NTSC/PAL auto selection, Latency: 90ms, Standard 5.5*2.1mm DC in and DC out port., FOV: horizontal 85°/85°(Left/Right) /vertical 85°/85°(Up/Down), Input Voltage: 12V 2A, Working Time: about 100mins, Brightness: 450cd/m2, Support 1080p HDMI in display., Dimensions: 246x 172x 20mm., USB for multimedia displayer and firmware upgrade., Standard 3.5mm AV in /AV out port., Display: 1920x1200p full HD, image rotation: 360°, Brand Name: Aomway, Contrast: 1000 CR, Power consumption ≤ 9W., Spectrum analysis: Yes, DVR Resolution: 1280*720P, Operating Language: 8 different languages, OSD menu: Voltage / Channel / RSSI / Battery Status., Charger: 15V 2A, Recording: auto save, RF receiver switch: OFF/ON/L/R, Support Max. 64G TF card., Auto brightness: yes, LED backlight, Sensitivity: 95dBm, Item Name: HD588 Monitor, Frequency: 5.8G 64CH, Build in Battery: 2400mah Li-ion battery.
Just check coupons out (with price alert and history). Best price?
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 Europe 
. I can’t find any active coupons for this product in Banggood. I’m not sure about the price, coz I have only 1 record(s) in my database.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): BGZASD1, 2019SPEDM, bgssaff9, Parts8, BGBCFPV, BGBCBG10, BGBFAFF2019, BGCITYADS2019, BG409412, bGhOnEy10, BGTT10, BGFPV-10
(probably won’t work, but you can try them out)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – Aomway HD588 V2 FPV HD Monitor ($-3)
Price history and price alert
It doesn’t make sense to generate price history chart, because there is one price record which is: $125.
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)).