A powerful and reliable e-pump that delivers up 120psi in just 50 seconds \n - Features an auto stop when desired pressure has been reached and also has an auto off function to save battery power \n - Compatible with both Presta and Schrader valves with the flip of a switch \n - Accurate within 2psi and takes only 1 hour to charge \n - When charging this item use a non fast charging source \n - 172g