Feature: 1. DTMF/FSK caller ID. You will need to first install 3*AA batteries in the compartment of the telephone base to so the screen illuminates. （Batteries are not included.) 2. Blue lighted display of up to 16 digits. 3 adjustable levels of screen LCD contrast. Stores up to the last 43 received calls (10 digits). Stores up to the last 12 dialed calls (12 digits). 3. Music on hold function. \"Full duplex\" speakerphone on base. 2 volume levels for speakerphone. Do Not Distrub function. 4. Setting Year, Month, Date, Time. 16 ringer melodies. 4 ringer volume levels. 3 alarm settings. Programmable Flash time.(90/95/100/120/180/300/600/1000ms). Tone and Pulse dialing mode. 5. Area code filter of up to 8 digits. PBX code input of up to 8 digits. Calculator function. Mute function. Specification: Features: DTMF/FSK caller ID. You will need to first install 3*AA batteries in the compartment of the telephone base to so the screen illuminates. （Batteries are not included.) Blue lighted display of up to 16 digits. 3 adjustable levels of screen LCD contrast. Stores up to the last 43 received calls (10 digits). Stores up to the last 12 dialed calls (12 digits). Music on hold function. "Full duplex" speakerphone on base. 2 volume levels for speakerphone. Do Not Distrub function. Setting Year, Month, Date, Time. 16 ringer melodies. 4 ringer volume levels. 3 alarm settings. Programmable Flash time.(90/95/100/120/180/300/600/1000ms). Tone and Pulse dialing mode. Area code filter of up to 8 digits. PBX code input of up to 8 digits. Calculator function. Mute function. Specifications: Color: Black Material: ABS Battery: 3 * AA Batteries(not included) Item Size: 19.3 * 15.2 * 7.5cm / 7.6 * 6.0 * 3.0in Item Weight: 454g / 16.0oz Package Size: 20.0 * 16.2 * 8.9cm / 7.9 * 6.4 * 3.5in Package Weight: 546g / 19.3oz Packing List: 1 * Handset 1 * Telephone Base 1 * Coil Cord 1 * Telephone Line Cable 1 * User Guide(English) Package List: 1 * Handset 1 * Telephone Base 1 * Coil Cord 1 * Telephone Line Cable 1 * User Guide(English)