Specifications Host Machine Model: F103 Material: ABS plastic Host Power: 100 mW, 315 MHz Host Launch Distance: 300-500 meters Host Power Supply: DC/9V1A The Maximum Number of Channels: 98 Receiver Standby State: 10 mA Working (Vibration) State: 75 mA Battery: 3.7V/200 mha Standby Time: 20 hours Standby Power Consumption: 25 mW Reminder Method: Vibration, Flash, Buzzer Host Size: 28 x 15.8 x 3.4 cm/11.02 x 6.22 x 1.34 inch Sub-machine Size: 10.3 x 4.9 x 1 cm/4.06 x 1.92 x 0.39 inch Package Content 20 x Pagers 1 x Antenna 1 x Adaptor 1 x Keypad 1 x Manual