1With 9 LED indicators, real time display of various information, such as signal display, call status, etc., let you know the melting situation in time 2It has the function of a meter, and a charging alarm mode. With multiple billing functions, it can be used as a public phone, which completely eliminates the meter and saves costs 3Adopt 300W communication module, good signal, good long-term working stability, clear sound quality, no noise in the call, no dropped call, strong signal reception even in remote mountainous areas 4The large LCD screen can display the signal reception strength, specific time, call history, call time, phone bill, etc., all kinds of information are clear at a glance 5Adopt anti noise circuit design, anti noise and antiinterference. 24 hour work, built in watchdog automatic detection, all round avoidance of collisions, prevent collisions, and avoid missed calls Item Type: GSM DialerProduct Size: Approx. 16 x 10 x 3cm / 6.3 x 3.94 x 1.18inWeight: Approx. 420g / 14.82ozMaterial: ABSPlug Specifications: US Plug 100-240VWorking Mode: GSM 900MHz/1800MHz dual frequencyPeak Power: 0.5 WPower Consumption: static 25 mA, emission 600 mASensitivity: -104 dBInternal Voltage: DC 5V / 1AAmbient Temperature: 0 ~40 Working Humidity: 45%~90% (under non condensing conditions)Atmospheric Pressure: 86~106 PkaEnvironmental Noise: <60 dBAntenna Overflow: 3.5dB (omnidirectional), 12dB (directional/option)AC Power Supply: 90-240V ac 10%, frequency 47-54Hz;DC Power Supply: 5V Package List 1 xGSMDialer1 x Connection Line1 x Data Line1 x American Plug1 x English Manual Note Cannot be used for POS machine access, fax, cordless phone (there will be cases where the incoming call does not ring or there is no caller ID display)