Temperatur: 150°C ~ 450°C, Max. 0.2mm for welding pen, Welding Pressure: 300 – 500 g, Welding Pin Range: 5 – 6 mm, Power: 1.5 KW (Instantaneous), Supply Voltage: AC 220 V ± 20 V/110V, Time of Eight Pulses: 8 ~ 80 ms (adjustable), Welding Distance: Adjustable, Power: 50 W, Electric leakage Switch Requirement: 60 A or more than 60 A, Current: 500 A, Time of Four Pulses: 2 ~ 20 ms (adjustable), Suitable Welding Thickness: 0.03 – 0.3 mm, Time of Double Pulse: 1 ~ 10 ms (adjustable), Output Voltage: 20 V DC.
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.
Updated:
Banggood
Warehouse in China.
Link: SUNKKO 709A Spot Welder
$210.78 with coupon: BG37ae98
$245.43 with coupon: BGPTL088
$259.87 with coupon: BGGines
Additional Banggood coupons:
1. First page
2. Second page
Country-specific coupon codes:
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – SUNKKO 709A Spot Welder [EU/CZ] ($-3)
Price history and price alert
Price history (for all/most countries) for SUNKKO 709A Spot Welder is here. The lowest price was: $169.99.
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)).