For Lenovo Slim Design 135w Slim Tip AC Adapter , 4x20q88539. Compatible with:P1, P15v, T15p, X1 Extreme, Ripple voltage shall be less than 350mV (peak to peak).（temperature at 25deg.C）. The adapter shall be capable of "hot plugging" into the end product. If an over-voltage fault occurs on the adapter output, the adapter shall shutdown before the output exceeds 26V. Adapter latch-off is allowed. (Shall be latch-off). Output20V~6.75A 135W Input Power100-240 V ~ 2.5A 50-60 HZ Lenovo Slim Design 135w Slim Tip AC Adapter , 4x20q88539, P1 2nd Gen, P1-20MD ,P1-20ME, ThinkPad P1 3rd Gen, ThinkPad P15v-20TQ , ThinkPad P15v-20TR , ThinkPad T15p-20TM , ThinkPad T15p-20TN , X1 Extreme 1st Gen , X1 Extreme 2nd Gen , X1 Extreme 3rd Gen