FEATURES: Compatible with wireless and wired system Two-way long-range signal reception Remote controlled by telephone Three groups of preset telephone numbers Monitors alarming scene Supports 4 + 2 format SPECIFICATIONS: Working voltage: AC: 185V to 245V DC: 12V to 20V Current: 1,000mA Chargeable standby battery: 0.9V 0.5HA, 6 x 7# batteries Receiving frequency: 433 +/- 0.5MHz Mainframe dimensions: 142 x 110 x 32mm Packing details: 10 pcs/ctn Measurements: 61 x 38 x 41.5cm N. W.: 16.4kgs