Features:Brand new and high quality. The design of the unit symbol display, more convenient to use. High anti-jamming. The power off automatically after no-working 15 minutes and alarming before the power failure one minute. Full function protection, anti-high voltage circuit design. The new battery door design, easy to replace the battery. Color: Black. Powered by 2X1.5V battery (Not included). Size: 12cm x 7.8cm x 1.8cm.