Weller Cordless Pyropen soldering iron is powered by butane gas.This iron is portable, lightweight and easily refillable. One gas tank filling lasts for approx. 60 minutes.System: Infra-Red/Ultra-infra-Red catalyst combusting butane gas reaction system.Use gas refill PGR1.Specifications: Overall Length: 186mm. Temperature range: 500º C - 1,300º C. Weight: 74g.