Features: 1) Does not need external power supply, small and light, easy to install 2) Capability stabilization, checks voice signal accurately, fault occurrence reduced greatly 3) Stores 8 groups of different access code / IP main in-numbers or IP cards, convenient for users\'\' use 4) Freely adds or deletes in areas which has gotten through in IP system scope 5) Provides individual and system password setup, prevents other lawless use 6) Long-distance setup function can modify any setting through the telephone 7) Does not change users\'\' primary dialing habit 8) Automatic startup IP functions for long-distance call 9) Unit size: 87 x 60 x 26mm Outer packing: 200pcs/ctn Carton dimensions: 415 x 395 x 33cm G.W.: 16kg