Style Duo 4G Black 2299 Specifications: Type: clamshell phone Standby time in hours: up to 160 Talk time in hours: 4-6 Battery: Li-ion 3.7V - 1000mAh Charger: 5V; 500mAh; 2.5W USB connection: USB-C 3G Band (MHz): 850/900/1800/1900 3G Band (MHz): 900/2100 4G Band (VoLTE): B1/B3/B7/B8/B20 Memory: RAM 48MB + ROM 128MB SIM Cards: Dual SIM (Nano) Micro SD card slot: up to 32GB Headphone Jack: 3.5mm Bluetooth: 5.0 Telephone languages: DE / EN / FR / IT/ GR / NL Security features Unique emergency button with SOS sound alarm & SOS call/SMS 5 emergency numbers Auto SMS notification when battery is low Extra loud ringtone Flashlight Speed dial buttons (2-9) Direct selection keys (M1/M2) Auto key lock ON/OFF Phone lock ON/OFF Switch SIM PIN on/off Change SIM PIN Restore factory settings Fixed dialing blacklist Auto power on/off