Feature:1. The idea is to lengthen the phone's builtin antenna to receive messages.2. It can prevent you from bad signal when traveling, climbing, or taking the elevator.3. Easy to install, simply peel and stick to the inner of your battery compartment.4. Suitable for any analog, digital and triband telephone.5. Not just for cell phones, but also for enhanced reception signal on twoway radios, PDAs, walkie talkies, buzzers and even cordless phones in your home.Specification:Condition: Brand NewItem Type: Cell Phone Signal BoostersMaterial: For PCBColor: As Pictures Shown Weight: Approx. 20.0gType: Signal BoostersSuitable for: Mobile phones and other smart devices.Package List:5 x Cell Phone Signal Boosters1 x ManualNote:1. Please allow 1-3cm error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.