1 mile (1800 yd) range; 16 levels of Gentle Touch Nick and Continuous stimulation; Vibration Assist (No Shock Alternative) and Vib+Stim Training options; Collar and Transmitter/Remote are RECHARGEABLE; 100% WATERPROOF Collar adjusts from 8" to 23" to fit most dogs necks; 100% WATERPROOF FLOATING transmitter; MAXX-Range 360 Internal FM Antenna System embedded in collar belt; Built-in safety shutoff with Smart LED Low battery charge indicator; Expandable to two or three dog units with additional Add-On collars; Backed by DT's exclusive DT Limited Lifetime Warranty