Amplicom AB900 Amplified Answering Machine Landline Telephone Accessory Adjustable volume amplified up to max 40dB Rotary frequency tone control and rotary play back speed control 24 minutes of digital recording with flash memory with day& time stamp One-touch playback with pause feature and skip, repeat or erase messages (Single erase or All erase) Two digit LED display message counter and 3.5mm jack for headset or neckloop (sold separately) RJ11 Jack is included along with clear and simple setup instructions Quick&UserGuide with talkback features are included TOLL FREE Customer service line (866)267-5426 2 year Manufacturer warranty.