2pcs H8S-2 Wireless Two-way Indoor Voice Pager 1. Two-way intercom, press and hold the PTT button to talk directly. 2. Mobile call, mobile intercom. 3. The actual call distance is 1000 meters, from the 1st floor to the 8th floor. 4. The appearance is slim, the thickness is only 18mm, and it is easy to carry. 5. The battery is 1800 mAh polymer lithium battery, which works 5 times a day, 30 seconds each time, and works for about 1 week. 6. The button adopts plastic + silicone structure, and the surface is high-gloss UV process, which feels comfortable. 7. Intelligent and humanized design, with intercom light and power light display, it is clear at a glance. 8. Put it on the charging stand when on standby, intelligent charging, never out of power. Parameters: 1. Power Supply: Polymer Lithium Battery 2. Battery Power Supply: DC5V1A 3. Operating Temperature: -20°C to 55°C 4. Transmission Distance: Approximately 1000 meters in open space, 20-100 meters through walls, 1st to 8th floors 5. Operating Frequency: B-Mode 462MHz, A-Mode 434MHz 6. Operating Time: Approximately 3 days per charge 7. Charging Time: Fully charged in approximately 5 hours 8. Ringtones: 38 ringtones 9. Ringtone Volume: 3-level adjustment (use the volume button when in standby mode) 10. Call Volume: 3-level adjustment (use the volume button when in active mode) 11. Dimensions: 116x56x18mm 12. Charging Cradle Dimensions: 70x56x29mm