‌SPECIFICATION: Carrier frequency: 2.4 GHz Encryption: 256-bit AES Simultaneous operation of systems: Yes, up to 4 systems Working range: 30 m Delay: 90 dBA Transmitter batteries: 2x AA alkaline Battery operation time: 12 hours Rack mounting: yes, a kit option with a handle is available Receiver dimensions: 200 x 165 x 44 mm Receiver weight: 0.358 kg Transmitter dimensions: 51 x 250 mm Transmitter weight (without batteries): 0.297 kg Packaging dimensions: 300 x 292 x 68.5 mm Package weight: 1.2 kg