Description :  Forecum 8F Doorbell 36 Songs Wireless Smart Door Bell Remote Control with Two Receivers for Home Office   Features :  Unique and elegant style. Low-power consumption design、 power saved and durable. Range in open spaces: Max. 200-300m. 36 varied style of tunes for optional. 4 levels adjustable volume. Transmitter and receiver can be paired freely.   Specification :  Receiver: Working Voltage: 90-260V Standby Current: 7mA Working Current: 60mA Working Frequency: 433MHz  Transmitter: Working Voltage: 1pcs 12V 12V23A (Battery Includes.) Working Frequency: 433MHz Standby Current: 1μA Working Current: 12mA RF Standby Power: 0 dbm Working Range: about 200-300m (on open air)   Package includeds :  2 x Forecum Doorbell Receiver (EU Plug) (Also come with a adapter according to your country~) 1 x Forecum Doorbell Transmitter   Details pictures :