Sorry it took a minute to reply actually at wrk just went on a break,its larger than a bullydogg an really just looking at it,its a manufacturers tool,I did see him used this same scanner on my 04 silverado truck,the dealership couldnt find out why my truck was putting itself in neutral,well he save me a ton of money with his scanner he can manually command sensors with this scanner I had a bad transfer case switch 40$ instead of the tansfer case the stealership said I needed.