ACS-RAM Communication System for Arai SZ-R Vas Open Face Helmets SENA The ACS-RAM is a Bluetooth communication system by Sena that was designed specifically for the Arai Ram-X open-face helmet. The compact communication system offers 2-way Bluetooth intercom and smartphone connectivity for listening to music, turn-by-turn GPS, taking phone calls and more Fits perfectly into the interior recesses of the Arai Ram-X open-face helmet. The ACS-RAMs speakers and microphone are easily installed into the helmet allowing for incoming and outgoing audio while riding. The compact design of the ACS-RAM allows for the device to barely be detected from the exterior of the helmet once installed The ACS-RAM supports 2-way Bluetooth communication at a range up to 500 m (0.3 miles), and features a 3-button control that lets users easily operate the functions of the headset while riding. The ACS-RAM is fully charged in 2.5 hours and offers a talk time of up to 12 hours Link the ACS-RAM with the Sena Motorcycles app to control many of the devices functions from your fingertips General Speaker: 48.2 mm x 14.6 mm (1-7/8" x 5/8") Boom Microphone: length 160 mm (6-5/16") Weight: main module - 86 g (3.03 oz) Operating temperature: -10C - 55C (14F - 131F) Intercom Working Distance: up to 500 m (0.3 miles) in open terrain Supports up to: 2 riders Battery Talk time: 12 hours Charging time: 2.5 hours Type: Lithium Polymer Battery