Size: l 150 x w 49 x t 24 mm
input power: ni-mh 4. 8v dc rechargeable battery pack.
gpsjm-b: up to 10 meters radius.
low output power will not cause harm to human body or medical equipment.
just in mobile phone size available for any place, without others' awareness.
use standard battery pack and battery charger.
continuous use in the automobile.