SIM800L module supports 4-band GSM/GPRS with operating frequency bands GSM850, EGSM900, DCS1800, and PCS1900MHz. The module measures 17.8 x 15.8 x 2.4 mm, making it suitable for space-constrained applications. The physical interface between the module and user is an 88-pin LGA pad, providing all hardware interfaces. Supports up to 50 keys and features a full-function serial port. Includes one USB interface that can emulate a serial port for convenient software debugging and download. Features two audio interfaces: microphone input and receiver output. Includes programmable general-purpose input/output (GPIO) pins. Provides a full SIM card interface. Supports FM function and PWM function pin. Designed with power-saving technology, consuming as low as 1.11 mA in sleep mode. Module specifications: - Frequency bands: GSM850, EGSM900, DCS1800, PCS1900MHz - Bluetooth: Not supported - Flash: 24 Mbit - RAM: 32 Mbit Main features: - Power supply voltage range: 3.4V to 4.4V - Sleep mode current consumption: 1.11 mA (AT+CFUN=0) - Quad-band support: GSM850, EGSM900, DCS1800, PCS1900, with automatic band selection - Band selection via AT commands - Complies with GSM Phase 2/2+ - GSM type: Small mobile station - Transmit power: Class 4 (2W) for GSM850 and EGSM900; Class 1 (1W) for DCS1800 and PCS1900 - GPRS connectivity: Default time slot level 12 - Optional GPRS time slot classes: 8, 10, and 12 - GPRS mobile station class B - Operating temperature range: -40°C to +85°C - Storage temperature range: -45°C to +90°C - GPRS data downlink speed: up to 85.6 kbps - GPRS data uplink speed: up to 85.6 kbps - Coding schemes: CS-1, CS-2, CS-3, CS-4 - Supports PAP (Password Authentication Protocol) for PPP connections - Embedded TCP/IP protocol stack - Supports Packet Broadcast Control Channel (PBCCH) - Data transmission rates: 2.4, 4.8, 9.6, 14.4 kbps