Block Wi-Fi ( 2400-2500 ) signal in a 10 meter (30 foot) radius. This small Wi-Fi jammer device is smaller than the average cell phone, and has the following great features:
Virtue Design.
A: Look like Mobile Phone. 
B: Internal Insulated Antennas
C: Replace Battery by hand, same like mobile phones.
D: Charging battery with Nokia charger.
E: High Quality Design, Low heat anticipation, Continues operation.
Technical Feature
Effectively jamming the downlink signal with no interception to the base station.
Extreme portable, the Jammer's weigh it is just 68g.
Low power battery consumption, Jammer's continues working time is about 2 hours.
Antenna
Omni-directional insulated internal antenna with High Efficiency. 
Chargers.
Mains charger: 110/220VAC input, 5VDC output.
Car Charger 12VDC input, 5VDC output.
MOQ 10 pcs  Delivery time: Within 3 days
Shipping: TNT; DHL; FedEx, or other express you like
Payment Terms: T/T; full payment before delivery