Designed jointly by Sena and SHOEI, the SRL is a communication system tailored for the SHOEI Neotec II, the upgraded version of the wildly popular Neotec helmet. Also compatible with the SHOEI J-Cruise II, the SRL is virtually undetectable from the outside of either helmet. The unit functions like 20S, but with a simple 3-button control. Compatible Helmets: Shoei Neotec II Shoei J-Cruise II Features: Talk time: 10 hours Operating temperature: -10° ~ 55° (14°F ~ 131°F) Dimensions: Speaker: driver unit unit 31.9 mm – thickness 4.4 mm Boom microphone: length 55 mm Wire between speakers: length 85 mm Weight: Module: 100 g (3.53 oz) Bluetooth: Headset Profile (HSP) Hands-Free Profile (HFP) Advanced Audio Distribution Profile (A2DP) Audio Video Remote Control Profile (AVRCP) Bluetooth 4.1 Intercom Radio: Working distance: up to 1.6 kilometers (1.0 mile) in open terrain Advanced Noise Control™ Built-in SBC Codec Wide volume control Sample rate: max. 48 kHz (DAC) FM Radio: Built-in FM radio with RDS AF (Radio Data System Alternate Frequencies) Radio region: worldwide Radio frequency specifications: 64 ~ 108MHz 10 preset station memory with automatic scan function Battery: Charging time: 2.5 hours Type: Lithium polymer Certificates: CE, FCC, IC