... free calls are configurable to make without payment;Function keys for follow-on calls, redial, volume regulation, shift of ... modification of control parameters are protected by 2 levels of password.ApplicationSuited for outdoor unsupervised environment (e.g. parks, streets, resorts ... Electrical Power SupplyAC 90~265V, 50~60HzCompatible Smart Card (for model GRIPS-V8-B only)Eurochip I, Eurochip II, ...