Specification Color: Black Material: ABS Style: Modern Shape: Rectangular Supply Voltage: 9V 1A Display Screen Type: LED Battery Capacity: 250mAh Transmission Frequency: 315MHz Plug: UK Standard Open Area Working Range: 1000m/3280.84ft Standby Time: 20-24H Usage Time: 18H Charging Time: 2 Hours Prompt Mode: Vibration, Flashing, Buzzing Number of Pagers: 16 Base Size: 23.5*15.8*3.6cm/9.25*6.22* 1.42in Each Pager Size: 10.3*4.9*1cm/4.06*1.93*0.39in Package Size: 28*19*10cm/11.02*7.48*3.94in Gross Weight: 1.45kg/3.2lbs Net Weight: 1.2kg/2.