... , RoHS, NF,VDS, BS EN14604 Approved JB-S508 wireless smoke alarm Main Features 1. Photoelectric technology2. Loud 85dB ... signaL in 3 metre3. Build-in signal transmitter & receiver,wireless interconnection by RF4. Sensitivity adjustable by 3-level5. HUSH ... Indicator10. Five-year limited warrantySpecifications 7. Wireless Frequency: 433.92MHz, 315MHz8. In-room Wireless Range: 35m (115ft) 7. Temperature: ...