ML01 Self-powered Wireless Door Bell 38 Ringtones Home Intelligent Alarm System,1 Transmitter+1 Receiver - White/EU Plug •No Battery Required: The transmitter has a built-in kinetic energy generation module,which does not need batteries or wiring. It is beautiful and easy to place •Strong Signal: Long distance transmission up to 150 meters in the open space,strong penetration of signals such as external walls,wooden doors,steel doors and internal walls •Waterproof: IP44 waterproof,not afraid of wind and rain. Rainy days can also be used,sowed and durable •Wide Signal Stability Coverage: Long distance transmission has strong permeability and wide signal stability coverage •38 ringtones playback: 38 polyphonic ringtones can be switched freely •Specifications: •Product type: wireless doorbell •Power supply mode: AC •Power supply voltage: 100~220 (V) •Scope of application: 150m •Ringtones: 38 polyphonic high fidelity music Package included: •1 x Transmitter •1 x Receiver •1 x English and Chinese User Manual •1 x Pack of Installation Accessories •Other items not include