For pets over 40 lb. 10 levels of stimulation (250V to 7000V) plus tone-only button with 100 yard range. Waterproof receiver and transmitter (with belt clip on back) includes red light low battery indicators on both. Receiver uses (2) 3V model No. CR2032 batteries; transmitter uses a 9V alkaline battery (both included). Will retain program memory if batteries die or if they are removed. Manual included.