ZL-401series：

(1) Power supply modes: DC(battery)
(2) Single-cold water form & cold/hot temperature adjustable form
(3) Main part made from brass;
(4) All-in-one sensor products are easy to install
(5) American micro-computer controlling technology
(6) Detection distance adjustable,the time of yielding water can be customized
(7) Plastic or brass shower head and shower head holder

ZL-402series：

(1) Power supply modes: DC(battery), AC power, AC battery standby
(2) single-cold water form & cold/hot temperature adjustable form
(3) main part made from brass;
(4) Some functions can be customized 
(5) American micro-computer controlling technology
(6) Detection distance and the time of yielding water adjustable
(7) Plastic or brass shower head
(8) The pipe of shower head is brass